This is tricky because regularity of the cycle and fertility are closely related. And it seems like there's a lot more info on PCOS in fertility texts than regular gynecology texts.
I have a book called "The Infertility Cure" by Randine Lewis, and its all about balancing cycles using TCM and though this book is about fertility issues, I think it could also be helpful for those not wanting pregnancy, but to balance their cycle. The author has acupressure and herb advice in the book so one could conceivably DIY in the absence of a practitioner. She lists lots of patent chinese formulas that can be found in teapill form online fairly easily and inexpensively. I've been studying this as well as some chinese medicine textbook previews on google to help me figure out what I should be taking myself.
http://books.google.com/books?id=wUU9_S6ByjgC&printsec=frontcover&dq=Infertility+oriental If you search in the book for PCOS, there are several pages of info on it in here.
So don't be put off by the title. I find it could be really helpful in figuring out other menstrual difficulties apart from wanting to conceive. There's a questionnaire in the book to help determine the underlying TCM patterns she might fall into (she might already know if she's been going to a TCM practitioner already).
Sounds like your daughter's lifestyle is great. Sometimes cinnamon and chromium (GTF) can work well for PCOS symptoms, along with a low glycemic index diet with or without the metformin. I've also heard of a supplement called N-acetylcysteine (NAC) 1.8-3 gm per day to help balance the hormones of PCOS. TCM would say to also avoid the "damp" foods (dairy, wheat, sugar, greasy etc). Exercise is super important.
So maybe Mary's person or this books could lead you to the right formulas. I've ordered patent formulas from 1stchineseherbs.com or chineseherbsdirect.com.
I've used Plum Flower brand, Min Shan, and Jade Dragon. They seem all reputable and state that they test for heavy metals and use good manufacturing practices. I think all three are out of California.
Hope that helps. Funny you should ask when I've been looking into this stuff too (not pcos specifically, but DIY chinese stuff for menstrual help). :-)
Wife of one fabulous guy (34)
Mommy of 3 awesome boys, ages 11, 8, and 4, and a precious 2 year old daughter.