On hands you often need quite potent steroids to regain control, then weaker steroids to catch further outbreaks early, switching again to stronger steroids if it's escaping from the weaker steroid.
Ointments are better than creams.
We often will use a short course of dermovate (clobetasol) which is v potent, switching down to eumovate (clobetasone) for maintenance.
Oily moisturisers are good at this point (Hydromol can be useful) - avoid anything with sodium laureth sulphate in it - some people can be quite sensitive to this and make things worse).
Once settling, urea containing creams can be good (flexitol is a great moisturiser).
Getting initial control is key - and that often needs potent steroids for 7-10 days - her GP should be able to advise, and it really shouldn't need a dermatologist (she'll likely be waiting forever!)