Context: I've been seeing this girl for about a month. She's has showed tons of green flags. She drifted toward commitment talk once, but I shut that down -- don't feel like committing to a relationship right now.

We have tried to fuck a few times, but she has difficulty with penetration. Like her body just won't accept me. She used lube, she drank some alcohol beforehand, different positions. Nothing works. Which obviously frustrates her. She expressed that she "gets in her head" which causes this problem. Beyond penetration, she is good with everything else -- gives a decent blowjob, excellent kisser. She is totally into sex with me, just physically cannot accept penetration.

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Any ideas why? Or how to overcome it?