I tried it for a few days and found it made me sick to my stomach. I lost around 5 pounds, but it all came back as soon as I started eating induction level again.

Plateaus are natural in any weight loss program. If she rides it out and continues eating properly then it will probably pass. If it continues into a true stall, 6 weeks no weight or inches lost, then she should probably review her manus and see if there are hidden carbs, not enough fat, bars or other known staller, or some other problem that can easily be corrected. If she doesn't have much patience and gets upset at a small plateau, then she will probably get even mroe upset by doing the fat fast, esp if she gains it all back, and may pitch whole plan out the window.