Do you think i should stop being friends with this person?

[elizabeth]

I known her for 12 years we were best friends then 3 years later she moved to another town but we stayed in touch wrote to eachother and talked on the phone. Then 4 years later she moved back to the same town and I was happy cause we could see eachother. Our friendship kept going well for a year then she started having issues with her family. We had arguements over facebook which was stupid cause I like rock music and stuff and she insulted it then she starts calling me a slag and fat and stuff. We fell out then a year later she thought we could patch our friendship up so we did then we fell out again. Then a year and a half later we met up once then never saw eachother for a year. I haven't seen her for 15 months and a couple of weeks ago she randomly texts me talking to me we were ohright. She has said nothing nasty to me but i seen her horrible behavior on facebook ,she nearlly got a criminal record once and she got kicked out. Shes slow at texting and texts me randomly expecting me to do her hair.