How to know if your best friend is really your friend?

Ok one of my bffs is Ashlyn she's kinda big and she always want to come to my house cuz it's bigger and it has more food and like every time I try to have a conversation she just ignores me and she live in my neighborhood so we ride bikes and stuff alot and like every time we meet we I haved to have something with me. There another problem she movin right after school OCR and she said she decided it.