i was thinking it could be her wanting me to date close.
What I might say, is "ask you out? I haven't even decided if I'm going to give you my number yet"
then maybe something like, "are you always this eager? you won't be asking me to move in after 3 dates will you?"
perhaps then try and date close? "I suppose we could meet up, if your that keen

"
or maybe:
"i was thinking about it, but realised I hadn't taken your number yet
this goes back to something she said in her email about her favourite date. she said a few guys asked her out before but she said she wanted to get to know someone first, by email and that she has never given out her number.
all opinions welcome guys - this will be my first attemtped close