Good to hear, always! And she can't go wrong with "Mind The Gaffe, The Penguin Guide to Common Errors in English," by Larry Trask [1944-2004]; Penguin Group (2002 paperback).

The title is misleading; it sounds like a "scold" book (a grammar "specialty," which is why no one wants anything to do with it). MTG isn't like that at all. Mr. Trask's robust and resilient sense of humor will win over readers of all ages.

Above all, buy the English edition; AVOID the American edition!