Doesn't matter if you have an FB or not.. People on here need to stop with the analysis of FB in respect to value and quality of a person. If you're being a little b1tch on there complaining about all your misfortunes and 1st world problems, then you're a b1tch. If you just have it to talk to friends and keep up with what's going on it's totally cool. (I had one because I play in a band, I would use it for networking, and keeping up with concert dates.) But eventually I deleted it cause I got sick of seeing pvssy ass statuses from some of my friends who don't know how to man-up.. And attention seeking dumb ass h0s. I could've just deleted them, but would rather spare them the frustration of me "being pissed at them" since I love hangin with those guys. I just do most of my networking face to face, over the phone, over email, or over messageboards now. Sometimes I'll have a friend contact someone via facebook to give them my number and other info for gigs and booking. That's about it.
When I had an FB I always deleted girls when relations went sour. Some of them have said "Why did you delete me" and sh1t like that, but I just ignore them. Plain and simple.. I deleted them to get them off my mind, but I'm not going to communicate with them why I did because I'm trying to get them off my mind. It's not pvssy, it's being honest with yourself.
I say you should just delete her. You need to get her off your mind and NC is the only way to go.