The safer choice would be to tell her to step back. You'll be given the space you need to evaluate your emotions and thoughts, and there won't be any new issues and complications that potentially/inevitably come about.

Of course, if you guys are good friends, you should at least talk to her about how things are and what happened before. If it's really bothering her, I'm sure she needs someone to talk to.. and you can also ask her about that particular night and how it has left you confused.