what am i supposed to do about my friend?

this is quite a long story but i'll try and make it short as possible.

we have had a rocky friendship- there have been a lot of fallouts- but once when we were talkin about this quite big fallout we had she said that she thought i was ill when i hadn't talked to her for 2 weeks.

basically, lately she had a fall out with my friend jan because me and jan, as a joke, went on one of our friends facebook profiles and changed her profile pic to one of my other friend purely because they looked similar. and then she started gettin stressy about it when it wasn't about her. so on msn jan was sayin it wasn't her - but because u cant tell the way people are sayin things on msn she thought she was beein serious. and so she got really pissed off with jan and because they had had a fallout before jan was still a bit fed up of her and so she sent an email sayin all the things she had been feelin for a while and that. but they still aren't talking.

so, i was talkin to both of them trying to work it out (not at the same time) and jan was alll up for making up with her but my other friend was still annoyed about it so i was sayin to her that you couldnt tell how she was sayin it (shes annoyed because she said she didnt do it) and that they are both pathetic (cause thats the way she describes every thing and one that annoy her) fallin out over a picture and then she had a go at me for "getting involved" and that i was makin things 10 times worse and all that. when she was bein horrible about another one of my friends and then because my other friend was upset she went straight over to her and that and she alwyas does things like that and it just feels like she thinks she is gods gift and that we are all somthing she scraped off her shoe.

so i was just wonderin what to do about this cos she annoys me soooooo much and has to be involved and i know that if i confront her with this she will tell everyone she knows what B***** i am and that.

so i was wonderin what u would do in my situation and if i'm just bein self centered and she is right?

thanks in adavance and we are all in yr 11