Anyone have any insight on what's in her head right now?
No, but you don't need it. I'm not sure you'd be any closer to the truth if you really could look into her head.
I say you don't need it because she's the one that has to initiate whatever comes next. All you can do is control what you do. You're doing a great job of being consistent and staying detached. She's at the very least getting more comfortable with you and more friendly. Just keep doing what you're doing, plus consider doing things for yourself if you aren't already doing so. The more fulfilling you keep your life, the less time you have to spend on worrying about what's going through her head. Just stay open to her invitations to do things, if she does initiate that kind of thing.
As for the concert: Consider it without her in mind. Would you buy a ticket to go alone or with someone else? If not, then don't bother. Thank her for the heads up and tell her you have other plans that night (and then make plans).
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer
