I totally feel for her.

I was struggling with (and still am) that particular form of OCD (I've had other forms too) and I'd say it is THE WORST form, because it's detrimental to your self esteem in multiple ways. I'd suggest maybe: "Get out of Your Mind and Into your Life" or "The OCD Workbook". Haven't found any books that particularly emphasize this form of OCD myself, though.

I also want to tell you, without frightening you both too much, that the "Pure-O" form of OCD is strongly related to bipolar disorder (depressions and manias or, just small manias), which I am suffering from myself. So just look out for moodswings that are a little beyond normal, too..