Im clearly not your a member of your intended responder audience, to ay the least, but here is a site that could provide some really good information www.theinternetescortshandbook.com

Written by an escort who really put a lot of time and effort into escort's education needs.

will top 1000 reads!

I actually see nothing wrong with her joining this wonderful profession. Unfortunately though unless she has educated herself to the ins and outs of how things really work. she might be in trouble.

Why not explore your sexuality in your youth...there are far worse things you could do in this world.

I have known plenty of women who got into the business young and it did not destroy them. Its all about attitude (brains help too, but its mostly attitude). If she sees it as a chance to explore her personality and grow and develop character then escorting can actually be great for young women.
Conversely, if for some reason they hate the job and they hate themselves for doing it then I honestly believe it can destroy a woman, regardless of her age. As such, I learned long ago I prefer seeing women who enjoy what they do and get something personal from it. Not just a job, but also an adventure in meeting people. They tend to be the happiest and usually provide the best experience, too. I dont wanna think a girl is gonna go home after the session and cry herself to sleep. If I think she's miserable and desperate I send her home immediately. I'd rather she sling hash for minimum wage than hate herself for the next 50 years.

My point is: Its not necessarily an age thing. There are plenty of young gals with the right mindset who could do the job and not be depressed. If she is willing to try, I say let her do it.

As for the mom issue: I think its more creepy and weird than frightening. Also the mom should think about it from a woman's perspective, not a mothers. She was willing to do it, yes? Why should she be the only one sophisticated enough to handle such a lifestyle? Doesn't she think her daughter could be equally sophisticated? I know, its different when its your own kid. Thats why parents shouldn't be relied upon to be objective. They usually cant.
So, I'd have to suggest she read a book on the subject. Would not be surprised if Amazon or Barnes & Noble had at least one title that helps parents deal with traumatizing realizations such as the daughter being an escort. In fact she'd probably have an easier time dealing with it since she's done the job herself. She already knows it doesnt automatically have to be a dehumanizing experience.