Has she had it diagnosed as anything specific?
My partner uses Epaderm and that's the only one that helps him out of Cetraben, Aveeno, Dermalex, Diprobase etc. Might be a case of trial and error to what suits her specifically. Nothing 'cures' it though, just provided relief and less symptoms.
I've read good things about salt water bathing, Egyptian Magic and Burt's bees multipurpose ointment, they are next on the list to try to actually eliminate it if/when it flares.
If you haven't already, look at everything environmental that could be causing it. Does she let toothpaste get on her hands in the morning, maybe uses a certain polish on her steering wheel, started using a different washing up liquid, shampoo etc. Also did she start taking a new pill or supplement or switch diets before it started etc. There can be the most unusual triggers.