You go to facebook login page entering the email address and type the login name 3 times (Wrong or no password) until it tell you the person's fullname .
And there you get the person's fullname and profile picture.
From inside facebook if you type in the e-mail address of a person in the search box who's profile is public (not private) you will find them without having to type the text to prove you're human.
you dont even need to go through the whole 3 times failed login to get a name and direct link to profile. just search for the email address in facebook's searchbox.
[edit] and i also think you should seriously remove her email address.