Sat Sri Akal veer ji..
It is nice that you want your partner to be in independent and financially stable.. I am pretty sure she can get a decent office job with her BA degree... if not Managerial, at least Admin, Secretarial..
Hairstyle and cosmetics.. I would say 90% of the women like this stuff.. but having passion for this kind of stuff is not that helpful for a better career..
I am not here to criticize any profession but I feel she will have higher changes of growth (financially and confidence wise) if she gets into Office related jobs..
You know there are lot of other good options such as being a good tailor, a good tutor(work from home)
You are not going to spoil her in any way if you want her to do something on her own...It depends what kind of sangat we have around us..what we watch, read and many other factors for us to become a better person or worst..
I understand your concern about salon job.. You know the place around you and how it could effect you and your family..
So please choose wisely...and I would not vote for Salon job..
Your mind knows the right answer Listen to it..