how would the girl link my UKP membership to my AW membership? Is that even possible?
If she has a verified AW account she sees the names of all the people who have subbed to her PG. If she for example is relatively unpopular and only has a small number of subs. She could possibly work out who it was from this.
She could also look at your past reviews on UKP and see who you seen previously, and then if you also left feedback for any of those girls on AW at the same time too. It would be easy to work out who you were from those two tactics.
(I hope this ins't considered giving girls ideas, but I figured it was all things a girl would likely figure herslef - especially with the help of Saafe)