Caroline, sorry if I have misinterpreted what you wrote but I am concerned about your hairdresser.

Eliminating proteins and greens (vegetables) from her diet is a really bad plan.

As far as eliminating water is concerned, the "rule of three" applies:

Three minutes without oxygen is usually lethal, three days without water is usually lethal and three weeks without food is usually lethal.

I really hope that she has not stopped drinking water.