Friend or enemy????help?

Theres this girl that i've went to skol with since 4th grade.(im in 7th grade now) in 4th grade we were the best of friends. then 5th grade she wouldnt even talk to me. 6th grade we talked a bit in the beginning of the year and she asked me to play bball with her @ the local YMCA i said no because i didnt want to play with boys. Anyway she never talked to me again. at the 7th grade dance i asked her if i ever did anything wrong and if i did im sry. she said i didnt do anything wrong. I probably shouldve said anything. My mom keeps telling shes just jelous of what i have. Now, everytime i see her at skol she either roles her eyes or pretends she doesn't notice me. what should i do! plz help!