What does it mean when a girl does that?

I was on the bus, and there was a girl sitting right next to me , she then picked up her phone and held it forward (using it like a mirror) and started playing with her hair in a way that seemed aimless , it wasn't styling or adjusting , just playing with it in a somewhat showy manner. She kept doing this for about 30 minutes straight , I felt weird and started giving her curious glances for a several times, in some of it when I looke at her, she would also look at me and then continue doing what she was doing , the story is old , but my curiosity remains to this day about why she did this and what her intention was , I was the only one on the bus who seemed to notice.

What does it mean when a girl does that?
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