Hi sevenstrings00!!!
Having been there.... and done that, (twice, actually), let me offer you some advice...
If you really are genuinely interested in her, (and not just for the free sex).... I say... "Go for it!"
My two longest relationships have both been with "customers turned BF". I don't purposely seek out customers to be my BF or anything... it just happened because I was spending time with them (as customers) and we grew to like each other. (Actually, that's not exactly the whole truth..... Truth was.... we were horny as hell, and we just need someone to boink the hell out of...

)
Anyways, my first relationship with a "customer turned BF" lasted 6 and a half years, and my second relationship with a "customer turned BF" lasted a little over 4 years (the guy in my posts that I call a**hole). The second relationship was a disaster... but the first relationship was good. It only ended because the passion was gone and I could not see myself marrying him. But he was always good to me, and I was always good to him.
The reason why I'm telling you to "forget it", if you're only interested in her for the free sex, is because it would not be the right thing to do. You would only be leading her on and hurting her in the end. I know sometimes, people feel that just because we are in the "adult business", that we somehow are less emotional when it comes to love and all that stuff... but it's totally not true. We fall in love... and we get hurt too. Sometimes, deeply.....
So if you're enjoying her services, but not quite sure if you want to take things to the next level.... best thing to do is be honest about it. But do realize though... that if you do decide to take things further, don't expect her to quit her work... 'cuz most likely, she won't. Or can't.... So make sure you're o.k. with her job. Otherwise, it'll just be a heartache at the end.
Best of luck....