She's your spoiled Step-daughter, and it's your fault why she's spoiled, since you've been treating her with nice gifts and an expensive luxurious lifestyle , basically treating her like a princess of a kingdom. She's been getting out of hand lately and it's your job to "correct" her bad behavior.

But you don't have to "correct" her necessarily. You can even join her tyrannic behaviour and force everyone who comes across you to kneel. Whatever choice you do about her will affect her in the long run, so choose how you wanna go at it.

I got the image on Pinterest.

Also, I suggest writing longer sentences, it's more fun that way.