Hello! So, I basically have the same experience as your friend. I am not surprised none of the doctors have mentioned vitamins or natural supplements... A lot of doctors, surprisingly, aren't too familiar with the condition. Is your friend also on metformin? Some people have been able to regulate their cycles by taking metformin. In terms of a natural supplement, I have tried "Vitex",chaste berry- a "natural supplement" after reading great reviews. I did not have a good experience, I suffered horrible, realistic nightmares and had to stop after two weeks. There's a website called "PCOS Diva" and she lists a lot of natural supplements that can help with a lot of PCOS symptoms, check her out.
For the second question, I haven't been on BC in about 3 years, so I can't remember. Sorry!
Third.. No I haven't.
My advice really is to watch her diet. It can be hard to give advice because I don't know all of her symptoms... But for me, changing my diet has helped me lose weight, clear my face of pimples, and regulate my cycle to where I will naturally get it about every two months. I am vegetarian and avoid most dairy. Also try to lay off sugar. This is really the only thing that has help subside a lot of my symptoms. Also, stress can cause more missed periods. The sooner she realizes that unfortunately this is the hand we were dealt, the better. The medicine I take is metformin and spironolactone. Hope this helps a little?