I would go with the DCP/Levi combo just because the DCP was designed for people who have cheat days.
Although honestly I would work with her on diet first, or at least while she is on the stack.
Its not easy but it can be done. I'm an avid hater of fish!!! But too achieve my goals I had to learn to eat at least the mild ones and sweet potatoes. As time has went on its getting easier and I do it on my own.