I know that laughter is good medicine, and P.G. Wodehouse is hard to beat for funny writing; similarly, Alexander McCall Smith's humour and humanity and his delightfully whimsical way of looking at the world can give a gentle boost to the spirits at any time. For the same reasons, I'd offer Gwen Raverat's memoir Period Piece - A Cambridge Childhood and Joyce Grenfell Requests the Pleasure (BBC Radio Collection) - who better than the lady herself to read that one?
Understandably, Linda doesn't want any books with grim subject-matter, so something uplifting and restorative is what we're after here. What would you prescribe?