I Have a Question

how do you deal with someone that i used to be friends with but now wont talk to me but shes always around my other friends so i cant talk to them either. i know her from the senior center and i used to talk to her all the time but now for months she wants nothing to do with me and i have no idea why, if i try to talk to her she wont talk, today we were eating lunch, i was just about to start mine and shes standing behind me talking to the girl at the left of me, i felt awkward trying to eat like that so i took my stuff and sat with other people, my friends knows that i move cause of that lady so she knows its not personal but i feel having her around not talking to her is bad enough but then she has to always be around my friends so i dont have them to talk to either. any suggestions other than hanging out elsewhere so i dont have to have her around, bad enough she wont talk to me but she has to cling to my friends as well so now i cant talk to them either