Does it mean anything if a girl squeezes your leg?

I asked a question around 4 months ago, about this girl I like. As stated in that question, I think she likes me too. I am pathetic, and haven't asked her out because I too shy. Today was the last day of school, and it was an awards ceremony. The teacher ended up putting her beside me in the row. Near the end, she randomly reached over and squeezed my leg, a couple of inches above my knee. Do you think this means she likes me? If so, I've kinda missed my chance. I probably won't see her over the summer at all. There's still Facebook though. By the way, I am 12.