If a girl rubs her leg against mine, is that possibly a way of flirting?

Anonymous
I was sitting in the bus the other morning, when a girl (who's a complete stranger to me) decides to sit next to me. Not much later her leg touches mine. This does happen more often in a bus, but not as firm and comfortable as this. It was pretty cold and we were actually keeping each other warm by exchanging body heat. By then I thought her to be only feeling comfortable sitting next to me, but then she began rubbing her leg gentle against mine in short intervals. Even though I'm pretty flirtatious by nature, I was pretty shy at that moment because I was so surprised I think. I managed to actually do it back, but not as comfortable as she seemed to do it. I'm afraid of being seen as some kind of creep in these kind of situations.

Now I'm wondering if it was just me being an idiot in the early morning... Or might she actually have been flirting in a cute kind of way?
If a girl rubs her leg against mine, is that possibly a way of flirting?
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