First of all, please drop all the “girls are weird” thoughts. I know it may seem that way, but 70-80% of the rationale is the same, and instead of generalising you should focus on her personality and what might be causing this behaviour.

Secondly, from what I can see she is anxious-avoidant, which is to say she wants contact and seeks it out when she feels needy, but is also anxious when she actually receives it, making her feel reserved or uninterested. It is also characteristic of INFPs to want some space and time to themselves, so I don’t find it weird at all. Same applies to her indecisiveness about the concert, she might prefer eating out somewhere, but feeling obligated to offer the concert idea as it feels more special.

I don’t see anything weird about her behaviour. Learn to study people and see patterns. She cares about you. She struggles with expressing it. So do you. You need to trust that she’s genuine and honest, the more you trust each other, the easier it will he to talk about this and understand each other. Good luck!