Sounds like your already on a good path. You've had her seen by a naturopath. She is obviously toxic. This is why most disease starts in the first pace. I would read any thing by Bernard Jensen for start. Also a diet like the Body Ecology Diet from Donna Gates would be very helpful. A goal of eating more raw food and less cooked would be good also. Another great resource book is Natural Detoxification by Jaquelin Krohn MD.
There is likely some other things that need to be looked into as well. Environmental concerns like a moldy environment, toxic surroundings(new construction materials), food sensitivities , etc. Need to be detective like to see what environmental triggers there may be.
Good luck and keep in touch.