Every once in a while, you should also go through your inbox, looking for conversations that started in a promising way but ended abruptly because the girl didn't reply to your last message; she may just have forgotten to do so, and a lot of times you'll be able to bring her back by reminding her. Look, you don't want to send off a bad email because you wrote it quickly and sent it without thinking.
I am hearing the advice on not overthinking things. The first two responses came in so fast I thought I was being stalked. This is why you shouldn't instantly respond when she replies to your message; if you do, you may end up having to exchange a higher number of messages before she's ready to meet you. Not being a woman, I obviously could be wrong about how women perceive these things. Enjoy the adventures of Andy Capp and wife Flo every day.