Give her some time to reply. I actually do that, some messages I reply to later on, but it is much easier to just log into Facebook and quickly update my status and comment on some, while responding to all messages at a later time. Definitely give her some more time to respond to you. Definitely want to space the time between messages. If she does not respond after a reasonable amount of time then send her another message. Also sometimes on Facebook, it is to forget that you have new messages, as sometimes I myself, would read message with intentions of responding later and totally forget about it, but definitely give her more time. She might be waiting for you to make that move. I know what it is like to wait for a guy to make a move and he chickens out, and I feel disappointed about it, but again give her more time. Sounds like she might like you, but if she is just a social, flirty person - she might be like that with others too. It depends.