I don't do the Adkins but I do low carb at my own modification.
and your friend maybe she needs some Cranberry juice.
doesn't Adkins say not to have fruit? well, that is one of the problems I have with Adkins.
I got rid of most sugar and the refined carbs that turn into sugar, but still eat healthy fruit and veggies.
I am into whole wheat, whole grains, but limit myself on them.
so maybe your friend can modify her diet to where her body won't be in such harsh shock.