The important thing here is to keep things in perspective. While you may have a fantastic time with this lady, remember that at the end of the day, it is in fact, a business arrangement and not a personal relationship. Case in point; I have been a regular client of a few different escorts, some of whom I've become close to, and have considered as "friends". That is, we have exchanged personal info/names/experiences with one another, and some have even gone on to do special things for me such as take me out for lunch and spend (a bit) of free time with me.
However, while we may genuinely "like" one another, there is never any doubt in my mind as to the fundemental nature of the arrangement, which is the providing of a service with no strings attatched. While it is not impossible for true romantic feelings to develop between two people in such a situation, it is few and far between. I'm not saying this to burst your bubble; I just don't want to see you get hurt. If you really want to know how she feels about you, ask her to see you off the clock. You'll have your answer, and know where you stand either way. Good luck!