She suddenly wants to be friends

I met this girl a few months ago. We'd been hanging out as part of a group for a while, then recently started just hanging out together and texting each other basically all day.

After a few weeks of this, I asked if she wanted to be more than friends, and she did. We went on two dates after that. After the first one, she went on about how much fun she had and how she couldn't wait to see me again. She seemed really excited about me in general ("I had so much fun last night" etc.). But, after the second one, I asked her if she had fun, but she just said she was "struggling with the more than friends thing".

I tried to give her some time to think, but I couldn't help it and started asking questions. The only reason she would give is that she "thought she liked me that way, but now she doesn't think she does". When I asked her what caused her to change her mind, she said "You're cute, interesting, nice, and funny, so I don't really know why I don't like you in that way."

So, I was just wondering if anyone could give me some insight into what could possibly be going through her mind. I don't understand how she can list a bunch of reasons to like me, but then say that she doesn't.

I'm just so confused and surprised... any comments or advice?

Thanks!