This is a character from Undertale The Souls Incident. Made by Jmccormic or jmcchannel.

(I suck at editing ea pic)

But wait!!!! This doesn't "Fully follow" the canon of the character. That's right! It's an Altarnate Timeline where she didn't die at all. Because canonically speaking, she's currently dead. This takes place before she met Robert T aka before she died. So she single currently in this Chatbot's take.