Ok 3 posts and now attitude, that is very quick, don't trolls have patience now.
I answered your question with a reasoned reply that once a girl starts it is too difficult to leave.
As to WHY she should stop, that could be family pressure, not liking it, not enough money, does not like cock, had a bad punter an endless list
Apologies if you think that it, is simple, I asked a question and you ignored it, is that normal? And you still seem to be missing the point
Not why she would have to stop, nor if it would be difficult to stop, simply
Why would she WANT to stop and work in a mundane job?
If I was getting up each morning and earning £3-400 a day for a few hours work I can not think of a reason why I would want to go and stack shelves in Tesco's for £200+ a week less tax if I was happy to do what I was doing.
If on the other hand, I was not happy with doing a job most women would consider degrading, I may be haoppy to live off next to nothing and not have to put up with doing it.