Sadly there is no ultimate remedy for PCOS. Resolving the problems of PCOS involves the slow and ongoing process of symptom control - the hirsuitism, weight gain, infertility, increased cardiovascular risk etc. Treatments will focus on these and what works one for one woman doesn't work so well for another so there's a lot of trial and error.
Metformin is a drug used for diabetes and works well in many women in reducing a lot of the symptoms and there are other medical drugs that help.
There is an increasing amount of evidence that a low GI diet is helpful for women with PCOS - have you tried that yet?
And cosmetic treatments such as laser hair removal are a good addition to medical treatment.
Sadly one of the reasons that PCOS is incurable is that there is very little money in research into it - it's not a 'sexy' topic like heart disease or cancer. For far too long it's been seen as a cosmetic problem but it is a threat to the sufferer's health and needs to be taken more seriously.
Another reason is that it's a complex syndrome that isn't fully understood (and without the research, understanding doesn't improve).
Many of my patients have suffered for years before they sought treatment or were taken seriously - don't give up pushing for answers. Find a good endocrinologist and work with her. Good luck.