I was wondering if anyone has had experience with this woman: http://www.thatmall.com/gisele/
She says she offers only massage but is not reviewed.

given that fact and the fact she is on ThatMall, that is probably the worst thing that will happen is you will get a legit massage.   ThatMall is a reasonably good site, I would not expect to find scams there.  

I know, you're wondering if there is a happy ending aren't you.  There is only one way to find out for sure.