In reply to Steve Hayward:
From my limited experience outdoors (depending on the rock and difficulty/style), chalk is not often required if climbing at lower temps (personally, anything at or under 15 degrees) or avoiding polished rock. Of course, if you're far more skilled climbers the higher grades might need it. Indoors, I suppose the typical answer is that maybe try avoiding chalk altogether. There's probably enough chalk on those holds anyway!
With regards to creams - am sure she already has experience using similar but in case not, how about 'AquaMax' cream? It is a medium-ish/thick-ish cream that stays on after washing the hands. Use it in the morning and then right after washing the hands after climbing. It comes in a massive tub so a small travel pot will be useful. The cream has personally helped in similar situations until it cleared up, but each issue to their own!
Edit: Apologies, I missed the above responses when I wrote the first paragraph.
Post edited at 20:38