Best get a job in a travel agency or airport terminal etc once out of college. She needs to gain more experience in customer facing, problem handling, etc, enough to give her some first hand experience to be able to answer the following:
Ever dealt with a difficult customer/ what happened/ how did you deal with it?
Give an example of when you worked as part of a team to effectively resolve an issue?
Ever dealt with a situation which needed you to have cultural awareness or an understanding of special needs?
To get a feel for what different airlines need, go online for application forms and check out the questions to get an idea of the sort of thing that she will need to accomplish or be competent/confident with before being able to approach an airline as a potential employee. Then think of part time jobs which are more likely to incorporate these skills.