Look for other web presence by this same person (Facebook, Twitter, LinkedIn...) Use the email address you have to search those sites for a profile.
Press for pics and a phone number when you can... but don't give any of your own info until you are satisfied that there's a real female (and she's the same one you are thinking it is) on the other end.
Other than that, you are on your own.
Last day off for my break... and the weather is completely craptastic too.
Still: Might try to get out and see Avatar tonight.