Hi kuro92. I think if cutting this person out of your life is something you want - or need - to do, but are afraid of how they're going to react - and that's okay, we're only human - cut her out all the same, and if she tries to contact you, ignore her, and if she continues to try to contact you, tell her to f-off - it will send out a message loud and clear. And stand by your decision, don't back down. You don't need to argue with these kinds of people, okay?
Hang in there kuro92, you'll be fine. And later on down the track, you'll be happy.