Help needed!!!

Amber

So I get my niece every other week! Her mom and I basically share her. It's my brother's baby, he doesn't have anything to do with her. Hasn't seen her since she was 2months old, she is 8 months now. She' ll be 9months the 23. Okay so she has to where she isn't sleeping all night! I use lavender Johnston and rub her down with lotion. She eats good before going to sleep. And she is still waking up every few hours wanting a bottle. She was asleep by 8:15 tonight and just woke up for a bottle! My kids never did this. They would only wake up once during the night around 12-1. They started sleeping through the night around 2 months (thanks to cereal). I know it isn't cause the milk is not satisfying her. She gets baby food, certain table foods, her milk. So what else it be? Any and all ideas how to help her sleep all night is welcome. I just can't think of anything else to help her sleep all night! The pic is just cause she is so beautiful and her yayas world!