Best friend troubles

So my bestfriend is being a phony ass bitch. She hated this girl a couple months ago and now she’s buddy buddy with this girl she used to hate. I told her I didn’t like the girl and she isn’t to be trusted. Only reason my bestfriend made amends with her is because that’s her boyfriends best friend. I keep on telling her stupid ass her boyfriends friends ain’t your friends. He cheat on you she not telling you. You kill someone she’s snitching. You get jumped she’s not helping. She then said I was antisocial. No I just know the difference between friends and associates. Am I in the wrong? Or is she being a dumbass like I think she is?