Eating low carb may really help. It doesnt have to be as drastic as Atkins, but what about South Beach?
My cousin had the same problem, she was slightly over weight, on Metformin, (but she was also diabetic) couldnt concieve but didnt want to go to a furtility clinic. About 4 months after starting south beach and losing about 20lbs she got pregnant with a little girl!
I am much heavier than your friend but eating LC almost erases all my symptoms of PCOS.
Another advantage of LCing, and I just learned this on Monday, As you lose weight your body releases hormones and actualy makes you more furtile. I guess hormones can get trapped or stored in fat and as you lose the fat the hormones are released making it easier to get pregnant.
I have 2 other cousins with PCOS (runs in the family!) that are not going the LC route, instead they are trying furtility drugs. Both have PCOS, only one is diabetic. The one that is not diabetic has been doing furtility treatments for 7 months with no luck, the other just started a month ago.
Another thing, women with PCOS are more likely to misscarry, (I have twice) because of the insulin/sugar issues. And I believe that the chances of this are greatly reduced by regulating sugar/insilin levels with diet.
I am no expert, by far. I just wanted to share my experiences with you. Everyone is different. I wish you friend the best of luck!