Hi there
I reckon it is just a matter of experience and perseverance.
At her age she may well be quite young however the right experience would help.
To my experience airlines appreciate experience dealing face to face with the general public possibly aviation related. Best option is to get a job at check-in desk then move to cabin crewing. Some courses may well seem worth to do however all airlines have their own training programme.
Jobs either as pilot or cabin crew is very hard to get as there are far more applications than vacancies.
Motivation and perseverance are the main ingredients to enter this business.
Best of luck
PF
P.S. a good book on aviation interview may help.