Do not use Johnsons Baby products...they are not good for your skin. We had tons of problems with them to the point that even MY hands had small first degree burns on them...no joke.
As with the other moms said look at the ingredients and do not use any lotion or soaps including shampoo/condition with alcohol in it either. I'd also stay away from sulfates, parabens and anything with fragrance. All these cause irriation to the skin and can only make it worse for her. California Baby sold at Target has products that are free of all these ingredients. http://www.californiababy.com/
I'm also a fan of the Jason products for kid shampoo and conditioners which are free of all those ingredients as well.
I'd also go to a health food store and ask what natural things tehy recommend such as supplementing with omega 3 (fatty acids). They can't hurt only help.