Facebook does this - it is very intrusive. If either one of you has stored your phone number with your Facebook account this link can happen. See this explanation.
http://www.dailymail.co.uk/sciencete...k-profile.html
This is just one more reason why you should have a separate punting phone and not use it for anything that connects to your real life.
You should check your Facebook account to see if you put your number there - if so, remove it. You should also contact the escort to advise her of the same risk. I don't see any problem in contacting her directly. Any indirect way for her to find out that you have seen her personal info would only spook her more.