Hello. I have a problem and I'd like to hear someone else's opinion on the matter.

A few days ago I went to a theatre along with my parents. Once the show was done we went into the lobby and started going outside. We suddenly heard a voice calling out our names. We turned around and saw one of my mom's friends waiving at us. We went over there to talk to her and I was introduced to her daughter (who is the same age as me). I talked to her for about 15 minutes and then they had to leave. To me it seemed like we hit it off immediatly. Anyway, it's been three days and I can't get her out of my head. I know that we probably will never randomly bump into each other because she doesn't live close to me and I don't know any of her friends. It must sound like a crush but I don't think that I will be able to get over her that fast. Now my question is: what do I do now?