What did her smile mean ?

Question

I went up to talk to a girl in the mall. When I was in the middle of asking her a question for the first time, she began to smile. I didn't even say anything funny yet. We didn't get to talk for long cause we were going in opposite directions. What did her smile mean?

Answer 1

it's a nervous reaction.

Answer 2

She was feeling you, it was probably something about you. :)