Dan Peters (who wrote Make Your Worrier a Warrior, a well-respected book for parents about anxiety), has now written From Worrier to Warrior: A Guide to Conquering Your Fears, aimed at kids 9-16 who suffer from anxiety. I picked it up from the library this morning, and read about half of it over lunch. Wow! This is exactly what my DD needs, and I expect to be buying a copy this month, although I'll let her confirm that before I do it.

He starts by explaining the fight-or-flight response, and how the physical symptoms of worry are useful as your body prepares itself to fight. Then he talks about the various kinds of thinking errors that feed anxiety, and finally talks about self-calming strategies and about practicing them. About the only thing I could ask for is that I didn't see instruction on how to pronounce "amygdala" (although I might have missed it - I was skimming a bit).

Highly recommended. (I see that Amazon is sold out, but it usually doesn't take them long to acquire more.)