This is perfectly understandable, and you shouldn’t meet anyone if you’re unsure or uncomfortable about it.
The same safety rules apply to a coffee date as any other date; check in with a friend before and after and make sure you have enough money to get home.
If meeting up is difficult because of location then an exchange of phone numbers might be the step that takes your communication offline and off the site.
Talking on the phone, or over Skype, will help you decide whether to overcome the obstacles to meeting because you’ll get a more realistic idea of whether there’s a strong connection between you.
I think the question should be "how many quality or discovery" emails before a meeting. She sounded very "posh" - for lack of a better word here.
This is also a good approach for people who aren’t very confident expressing themselves in writing.Hell I'd get too bored with that, sorry women but I don't think anyone is worth chasing for that long before even getting a face to face in a public place.