Although it may sound counter-intuitive, it usually helps to eat something light before flying (non-fatty ham sandwich or something like that). Chances are it may be more to do with nerves rather than actual motion sickness since she sounds new to the job.
There are tablets of course, but some make you feel like a zombie and there are also acupressure bands which are reportedly effective.
If it's any consolation, I managed to make my instructor airsick when I was training - so it can happen to anybody. Good luck - I'm sure things will improve with more air time.
