If a girl leans on you and pushes against you while sitting besides you, does it mean anything?

Anonymous
A friend who is a girl was showing me pictures she took of the night we were having, it was another friends birthday and she was leaning into me laughing while looking at the pics. Was she trying to do something or is this just a friendly thing. I have never had many friends that were girls and never dated and not good at picking up signs. She does have a boyfriend of a long time. We were out with all girl except for me. There were supposed to be other guys but they didn't show. Does he leaning on mean anything?
If a girl leans on you and pushes against you while sitting besides you, does it mean anything?
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