New gf

I got this text over the weekend. It's a girl that got my number from someone. There's not many people that has my number. She said she has a crush in me for a long time but hasn't said anything. I'm trying to figure out who it is. She's only 12 but I'm cool with that. She wanted to know if I wanted to go out with her. I said I'm cool with that so now I'm trying to figure out who she is.