IDK What to do with this Person =/

I can see where your coming from for not liking her changing the drawing but really she is just posting the image for show. She's not taking credit for it, she is just altering it in the way she thinks is cool or cute. If facebook allowed your complaint to followed through then they would have to do it for every picture altered on the internet. If anything you shouldn't let it get to you too much, you might even want to appreciate that she enjoys your artwork.