I was a victim of bullying, too, and it does suck. I always had a couple of good friends, though, and by the time I got to high school I became part of a different social circle--never one of the popular kids (highly overrated, IMO), but pretty much smack in the lower-middle rungs of school society.
But for me, Junior High was the absolute worst. Kids that age have the power but haven't learned the empathy (lots of kids, anyway). My "mean kids" mellowed out a whole lot by HS.
Are there maybe some outside activities you could get her involved in, that involve kids from other schools? Something maybe she's good at, that would allow her to earn a place with other kids who share the same interests? Sometimes just having that other outlet for socializing makes the lack of social life at school more tolerable.