Need advice badly with something?

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So I was at this Christmas Eve Party yesterday and this really beautiful girl comes and talks to me. We talked the entire party, literally until you had to leave I talked to her. She seemed like she was in to me. (We were talking about tennis and she found out that I played tennis) she told me she had never played a real game of tennis, but only done practices. Then she told me she really needs to get ready for the tennis season at my school (i'm playing too). She was also twirling her hair and stuff like that too. There's only one problem, she's a senior and i'm a freshman. We followed each other on twitter so I was either going to DM her if she wanted to play tennis with me this weekend (right before she left I said, "Hey maybe we should play tennis sometime." I think she said "Yea that'd be cool" but I was so wrapped up in the fact that I successfully talked to a senior I didn't hear her.) Or should I wait 2 weeks for school to come back in and ask her then. Should I even ask her?