I agree with what everyone has said about your situation.
Speaking from my experience I can tell you that your chances with this girl are NOT good. I was in a similar situation to you about 9 months ago with a bar girl I met in PI (see Foreigner's First Post). I developed an attraction for her through email and webcam, same as you.
I went to see her in PI a couple of months ago and found out that she has been 'sponsored' for some months prior to my visit by a very wealthy expat. Needless to say that my affections were no longer required and she told me she intended marrying her sponsor (as soon as his divorce comes through

)
Although I didn't get taken for money (well not too much), I learnt a valuable lesson - for girls in this business its about money and security. They don't want to work in their environment but do so out of necessity. As a consequence they will do anything to get away from the lives they now lead and will take the first opportunity that is presented to them. Wouldn't you if you were in their situation?
Not saying that this will happen to you, but be careful and be prepared for many other revelations for which you will be totally unaware.
Cheers