Should I stop being friends with this *****?!?!?

so theres ths girl ive been friends with for 2 years.. shes a year older than me, and we're best friends.. she put me #1 on her top friends, and we're have alot in common... idk one of my ex bfs told her a realllyyyyy bad rumour about me (which was fake) and at first she felt like she was ok with it, and same with another friend (we were a trio) but now my 'bff' and the other friends dont talk to me anymore , i asked my bff if we could hang , she responds like 6 HOURS LATER later (this b**** carries her phone everywhere she goes , she answers her texts in a second) and says we can hang the next day, so the next day i cancelled my plans JUST FOR HER, but she never texted back . its been 4 days and she hasnt said **** to me . im a good friend, i dont backtalk anyone , but idk what to do . should i just leave her ? my parents think shes a bad influence , plus i feel shes out for her own gains.. am i overreacting?