What do I do in this situation?

So when I was little I had this friend and for the sake of this question I'll call her Lexa. So fast forward to now I'm 14. ( So is Lexa) I haven't Lexa in years. My mom was at the beach with her friends this past weekend and saw Lexa and her friends. My mom is good friends with her parents and asked where they were, and Lexa said that they dropped here off there. (All this info is coming from my mom by the way). So as my mom continues the story she says how grown up Lexa looks. My mom says to me "Lexa looks so grow up, she was wearing a bikini and has big boobs." Yes, my mom said that to me. My mom tells me that Lexa said she wants to call me and hang out some time. I don't quite know what to say, mainly because I don't know if I'm going to say or do something stupid or weird. I only have 2 friends that are girls, both are younger than me and are more like family since we see each other all the time and our parents are good friends. So what do I do? My mom hasn't actually given me her number, and to my knowledge my mom hasn't given Lexa my number. So again what do I do?

Nick
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I'll try and get her number.
What do I do in this situation?
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