Elita-1 and her sisters were held in reserve as NEST entered Shanghai to deal with Demolishor, only being called into action when the presence of a second Decepticon, Sideways, was detected. Together with the twins, the sisters pursued the sneaky speedster through the streets of Shanghai, smashing through buildings and everything else in their way, but ultimately they weren't able to do much damage, so Sideswipe was brought up to bat, and proceeded to make short work of Sideways.

When The Fallen issued an ultimatum to Earth, the US government decided that the Autobots would be shipped back to Diego Garcia, but NEST disobeyed the orders, instead shipping Elita and the others to Egypt on the advice of Sam Witwicky, who had the means to resurrect the recently deceased Optimus Prime. During the climactic battle between NEST and The Fallen's Decepticons, the sisters arrived with Ironhide to help escort Sam and Mikaela through the warzone, but Elita-1 was one of the first Autobot casualties of the battle, being shot down from behind as she called for Sam and Mikaela to follow them. the idw comics:

Thousands of years ago on Cybertron, Elita-One was one of Sentinel Prime's followers, alongside Optimus, Megatron, Shockwave, and others who believed in his teachings of the Dynasty of Primes and the AllSpark. When Sentinel Prime proved the truth of his claims by unearthing the lost AllSpark from beneath the surface of Cybertron at Simfur, Elita helped defend it against an attack by the non-believing Thetacons until Wheeljack was able to warp time and space and bring a sun into Cybertronic space, thereby repowering the AllSpark and the plant. With this, the Thetacons accepted that Sentinel Prime had been right all along, and an end was called to hostilities. In the wake of the conflict, as new life began to spring on Cybertron, Elita told Optimus of her two sisters in Metrotitan and her desire to see them again, and Optimus decided to go with her. Foundation #1

Elita-One can't get enough of Optimus's eyeing her.

Elita and her sisters were later present during Sentinel's speech on Unification Day. She told Optimus that her sisters would have killed her if they missed it. Elita and Arcee joined Optimus's Science Division, while Chromia became part of Megatron's Defense Force. Foundation #2 Years later, when the Science Division unearthed a strange relic and Cybertron was attacked by the aliens of the Eshems Nebula, Megatron changed his military's mission to one of peaceful defense to aggressive offense, taking the fight to the aliens. Elita stayed behind on Cybertron, remaining true to Optimus's belief in the peaceful core values of their planet's society. Defiance #2 Studying the relic fragments they had uncovered alongside Arcee and Ratchet, Elita discovered that they all bore the same symbol in the same area: a symbol was also on Optimus's head. Drawing a correlation between the symbol and the Dynasty of Primes, Ratchet theorized that Optimus was involved with it somehow, redubbing him "Optimus Prime". Defiance #3

When Megatron reformed the military into the Decepticons and ordered the Primes to be assassinated, Elita came under fire with Sentinel and Wheeljack at the excavation site. Optimus and Chromia came to their rescue, and they escaped via a tunnel to Tyger Pax. Elita witnessed the departure of the Nemesis with the other Autobots, and became one of Optimus's closest advisors with Sentinel and Ironhide. With the war tearing Cybertron apart, Sentinel proposed using a "torch" to end the war without further loss of life. Foundation #3 It required the AllSpark to work: as Optimus battled Megatron at Simfur Temple, Elita successfully activated the torch and delivered it to Sentinel. Sentinel boarded the Ark and flew to Simfur, but it was all in vain after Starscream blew up the ship. Foundation #4

Elita-One joined a vengeful Optimus Prime in a charge on Megatron's citadel. Shocked at the coldness and violence her old friend was displaying on the battlefield, Elita entreated him to stand down, telling him that such actions were not who he was, but he retorted that Megatron's death was all that mattered. Foundation #1 She was left behind when Ironhide decided to help Optimus Prime. Foundation #2 Though Optimus did not go through with killing Megatron after her sisters stole the AllSpark, Elita still found herself unable to speak to him. Foundation #4

Sometime in 1908, Elita-One were part of an Autobot team sent to steal energon from the Decepticons. Instead they were ambushed by Shockwave and his troops, and Chromia was killed in action. Rising Storm #2

After the Autobots claimed victory in their first great battle with the Decepticons on Earth in 2007, Starscream began a plan of his own to create an artificial Replica AllSpark, and had Elita-One, Grindcore, Signal Flare, and Warpath captured and put to work constructing it at Simfur. When Starscream arrived to inspect the cube, Elita pled with him for mercy, but none was dispensed. Upon the AllSpark's completion, she was strapped to it, with the intention of draining her life-force to power the cube. The Reign of Starscream #4 Arcee arrived too late to stop her sister's death, but blew up the generators used to store the life energy in revenge, throwing the Decepticons into disarray. The Reign of Starscream #5

Not long after, Elita-One's remains were acquired by the deranged Decepticon experimentalist Flatline, along with those of her sister Chromia and taken to his lab at an outpost on an unknown planet to use in his attempts to create a new breed of tripartite soldier, three bodies fuelled by a single spark. After several failures, whether by coincidence or design, Flatline was presented by Thundercracker with a new test subject: Elita and Chromia's sister, Arcee. Through the use of Arcee's spark, implanted in a new body, Flatline reignited the life-forces of Elita and Chromia in new shells, albeit not as they had truly had been before: now, they were at one with their sister, a singular entity at the spark, each feeling the sensations and emotions of the other, yet retaining some degree of autonomy and memory of their own identity. "One as three, and three as one". Grappling with their new forms, the sisters broke free, liberating Flatline's other victims, the twins Skids and Mudflap, in the process. Tales of the Fallen #6 Rising Storm #1

A short time later, the sisters, the twins, Sideswipe, Topspin, Leadfoot and Roadbuster arrived on Earth on the Wreckers ship Xantium. (While the ship and the Wreckers stayed behind in NASA) Dark of the Moon Dark of the Moon #3 in response to a summons beamed into space by Optimus Prime. Joining the allied Autobot-human strikeforce NEST, the new recruits received some training, and were soon called upon to put it into use: the Decepticon Demolishor had been sighted in Shanghai, China. Alliance #4

When NEST discovered that Starscream was selling Transformer weaponry to humans, a sting operation was staged in which Theodore Galloway would pose as a buyer to lure the Decepticons in. When Skystalker, Divebomb and Fearswoop took the bait, Elita and her sisters joined the twins and the human forces of NEST in tackling them. The sisters did not take kindly to Skystalker's bewilderment that the Autobots were sending their women to do the fighting for them, and killed him with practised ease. The violent streak his old friend was now displaying gave Optimus Prime pause, reminding him of the time in the past when he too had sunk into the depths of rage, and how Elita had disapproved of it then. all of this is from tf wiki XD