Ok, so this is my first post here and I met a girl last night while out with some friends and never did get a chance to get her number so I got it from a friend this morning so I texted her "Hey, it's (my name here) from last night. (Friends name) gave me your number. It was great meeting you, we should do it again some time." She replied back instantly saying "Ohh hey" so I obviously wasn't gonna text her back for a while I was gonna wait but she just texted me "Where do I know you from? You look so familiar."
So, What should I do? Should I wait and text her some time a lot later and make up the excuse that I was busy doing something or reply with something now? Also, I'm pretty sure I've never met her before so I don't know if she's just seen me around town or if that's just an ioi. Any ideas?