This is probably the explanation. She wanted an AW email with the phone number on it so she could check reverse feedback I would guess.
Never really seen the point of this.
I find the email system a bit of a faff, and if there's a phone number, it's far easier and (hopefully) quicker to message her. Book this way and you're not leaving or receiving feedback in most cases.
I personally don't want to spend £100 on say half an hour just to get 1 positive feedback in order to see someone. What difference that feedback makes, I don't know. There's no guarantee I'll actually turn up, and if I were to get a negative, an easy new email address and clean punting sim gives me a new account.
Seems to be a bit too much jumping through hoops for some women these days. I just want to text "are you free at xxx for 1hr?", turn up, do the deed and move on.