You don't say how old she is. I suspect that something is going on with her that really has little if anything to do with you.
You don't say if you've spoken to her dad or her about your feelings---depending on the relationship and her age, it would be good to at least let her know (from dad or you, or both) that your feelings are hurt. I wouldn't bring up what you've done for her, kids often feel, when adults do that, that the "ungrateful" card is being played; hopefully you did what you did for her without expecting something in return.
Expect changes as children grow.((((((((((((((((((hug)))))))))))))))))