Girl says I understand her, she feels comfortable talking with me over her friends - good or bad sign?

cheesesteak7
Long story short:

This girl (whom I'm quite fond of) during a study session said that I "understand" her, particularly the way she talks and the things she talks about. She isn't a great speaker and she talks a lot about philosophy, astrology, etc. After a long lunch date (well, pseudo-date, we went dutch), she thanked me for the time as her friends don't like it when she talks or they don't understand her.

I know every girl is different. To me, this can either be:

good - she feels comfortable around me, I'm different than her other friends and offer something unique in her life, perhaps building some kind of attraction

bad - she feels comfortable around me and, since she's somewhat immature, sees this comfort as something can be nothing more than a good friendship

your thoughts?
Girl says I understand her, she feels comfortable talking with me over her friends - good or bad sign?
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