Pive aggressive friend issue?

ive been friends with this girl since we were little, id actually consider her my best friend- but recently, stuff has happened that has caused me to rethink my friendship with her.. and the fact that im even considering dropping her as a friend is sorta a red flag. shes so pive aggressive and sneaky, whether its a text msg, facebook wall post, etc, my reaction when i read alot of stuff she writes is like the face burning turning red sensation. ive tried to ignore her and hope this helps, but she calls even more- when is enough enough and can i fix this??