I agree with you, and that would be the case IF she ever got a job as a waitress or anything like that, usually when you have kids you can't get any jobs, people don't want to hire you since you are a liability. I went through something like your describe. I was 30, divorced and with no education, I had an 8-year-old and no one would give me a job. I'm not a prostitute though hehehehe because I had my parents support, but I had to move back to their house and become a "child" again under their roof under their rules, so I know the desperation you might feel where you just can't find any solution for a situation like this.
On the other hand I believe there are women that choose this path because they can become really wealthy, and they have a talent for it.
I don't know if being a sexed up person has any influence in it. I imagine it does, if you like your job you'll do it well and customers will be back and ask for more, like in any other job, so one of my deepest secrets is that I think I would be a good prostitute! LOL