Do you think this girl likes me?

she definitely does! unless she is just that friendly and excited to see everyone, she is genuinely happy to see you! if she blushes and smiles a lot then its guaranteed. us girls aren't as complicated as everyone makes us out to be. if you like her, ask her to hang out sometime, you guys could go grab a bite to eat. it sounds like there is something there, so be brave and take the first move. age makes no difference.