@Ferostie,
A close friend of mine once worked as a stripper for a spell... It's a job you have to be more careful in than most in terms of protecting your mental health, so to say. Also in terms of warding off the temptations of harmful choices (drinking, drugs etc, though as a new mother I'm sure your wife wouldn't be too vulnerable to those, as well as exploitative employers).
On the other hand, having done this before she does know what it's all about ... plus, it's not like working twelve hour day jobs doesn't involve its own burden on your mental health!
It's a tough job, specially if you're in Afghanistan and she's alone with a baby daughter... But it sounds like it'd be no tougher than any alternative she might have, in order to pay for school - and going to school is always good.
Sounds like both of you have a tough row to hoe - take care and be safe!