screen late at night are not good policy, you can offset the effect by choosing colour schemes that reduce the blue content (that fools yer brain into thinking it is day).

If fat fingers are a problemo, get a rubber-tipped pen for prodding. Get one that writes, so in daylight she can jot things down when hunting for anagrams. I have three 4 inch ones called "Poquito Stylus". The only place I can get them (hence 3 - I loose them) is a stationers in Malvern. The company do mail-order but not with the pens, the shop will send them though.

I find my 5 inch Sony copes with my slender fingers anyway.