We all decide what constitutes a 'deal breaker' for us in relationship. I think OP, if it is a deal breaker for you that someone has not previously had many partners or worked in sex industry then it's something you need to get sorted in your own head. Only you can know if there is any possibility you'll feel differently about her past - listen to your gut here. She is the same person, her past is part of her and will have shaped who she is today.

I do agree with others that there will be other men out there who will not be disgusted by her past, who will be willing to accept that part of her life, and are possibly better suited to her as a partner because of this.