Sorry that you are here HBH. I would suggest not snooping, but I think you are right that there may be OM in the picture. You can keep your eyes and ears wide open without snooping. If your gut is telling you that there is an OM, there probably is. Are you in MC? Have you asked her about it?
It sounds like you have been doing a lot right lately. I agree if she comes to you should recipricate the affection (for now). If there is OM in the picture, then things may need to change. However, do not pursue her. Go out GAL yourself, excercise, take care of your depression, make yourself attractive.