Health, then what’s the point of paying for the surgery and going through with it if she will be right back where she started from in addition to the agony of being sick and throwing up because she can’t commit to a healthy routine.
It is better to spend the money on the one on one trainer, therapist and nutritionist and maybe once she has a program started in order to see faster results if EVERYONE agrees and is on the same page, go through the surgery. THAT would be great because then she would have a real support system, a team of health professionals who have gotten her on the right track and will be there for her to help her continue on the right right track to realize her goal.
If she would consider such a plan, then she can realize a long term success because she would be able to achieve a change in behavior and a new way of living her life not just a quick fix.