Has she been ignoring me??!! Friendship issues?!!?

I have a gal who is very sweet and is my best friend..She had a lot of love for me when we first started to be best friends..But things have been going from bad to worse..She refuses to give me attention like when I say hi,she jus wards me off.....i.e.,we are of different sections..(I am of B and she belongs to A)..She has a lot of friends in my cl..So during the recess time and all other free time she s to my cl to have a chat with her frens!! And so lets say I am sitted in the first bench..She would jus go around the cl like she has not met me even once..She would happily chat with everyone and then leave the cl..She even smiles at her enemies..And she speaks to everyone including her other best frens jus to envy me..I don know what crime I had committed to earn her humility..I am really hurt by this..Atleast when we walk towards our home she could communicate but that too has become difficult for her..I am worried she is ignoring me..Should I continue with her..??But I wanna be her friend still cuz I cant find a person like her again..But she is jus so rude to me..She has morphed..I jus need advices on this..Plz?!! Thanks..