Met this girl whilst doing daygame. Got coffee with her for an hour, and we had fun. Made out a bit. Near the end of the date, whilst we were walking she said "I don't usually this (date/makeout I assume) with guys I just met", which I just ignored (a mistake in hindsight). Anyway dropped her off at the station, and since her phone broke literally earlier that day before I met her, I gave her my number (she made a point of asking for it), and I took her facebook. Anyway before we said our goodbyes, we talked a bit about trying to meet up again before she went away to uni a few days later, she seemed...quite keen on it.
Added her on fb last wednes, she accepted a few days later. I did get a bit worried before she accepted, as I sent her a message saying it was good to met you and some inside joke. I assume she didn't see that message as if you send a message to someone you're not friends with, it goes to the Other folder which very few people know of. Anyway, since me and her were very pressed for time (she was leaving on sunday to go to uni), I messaged her soon after she accepted me, asking for her number. She hasn't replied since.
But I know that she has been on facebook, just earlier tonight in fact, as she's accepted more friends. So....what did I do wrong?