It's all well and good asking everyone elses opinions and such, but you haven't actually said what you want to do clearly I don't think.
Everyone here will give as much moral backup and advice based on their experiences as we have. We've all had our fair share of loves and losses I'm sure, so we can relay our experience in that respect. However the one person you need to listen to is yourself.
What does your gut instinct say about the situation? Does it say you need to be a friend, or something more? Does it say you need to do something out of your usual character to expose a side of yourself she's never seen? Or does it tell you to run and hide? Ignore us, we're not you and we're not going through those exact feelings and that exact situation right now. Listen to you.
I hope this doesn't come across as harsh or anything, I don't mean it to be, but sometimes you need to get tough on yourself.