((((((Jmo531))))))
Could you try talking to her and letting her know that you feel this way? Otherwise she'll think it's something she's done wrong and she'll agonize over details as to what she did or said to make you not want to be there for her.
I know it's hard to be vulnerable but I don't think you want to hurt her. If she's being persistant then she must really care. That's a good sign.
Try to explain it to her as you have done with us. What's the worst that could happen? Just try. You can be a friend and you do know how to. Use the Golden Rule as a guide. I know it's easier said then done sometimes with insecurities and everything but you're really an awesome person who feels misunderstood. You're misunderstood because you're having a problem with communicating. If you get that out up front then isn't half the problem solved? I think you're just scared. It's going to bug you otherwise and you'll live to regret it and you'll think to yourself "what if..." I'm talking years of remorse over something so simple to resolve. Go on...do it... NOW!!!!