I would take her to see an allergist and they can run some test to see what allergies she has and what is causing this so she wont continue going through this painful sounding process.
Hello and hope you are doing well.
The symptoms described by you could be due a skin disorder called eczema. People who suffer from this disorder should avoid contact with triggering factors like soaps, cosmetics, jewelry, clothing, and detergents. Sometimes sweat, changes in temperature and psychological stress are known to trigger these episodes. So, the best way to prevent attacks is to identify those substances which she is allergic to and avoid them. Consult your primary care physician for therapy. If the need arises he may refer her to a dermatologist.
Hope this helped and do keep us posted.