I have PCOS, I don't thing awareness was really there when I was a teen but the symptoms definitely were! I started the pill around 15 I think? So not much older than your daughter.
Initially microgynon, and then tried various others. They all helped with the periods (to the extent that any bleed fell in line with the break so it was predictable, which made a huge difference to my quality of life) but did little for any of my other symptoms. I used to take oral medication for my acne (I can't remember the name but I remember they were yellow and red capsules!) and a medicated topical cream. I started Metformin somewhere around 18/19 I think from memory, although I may have been nearer early 20s, I initially had NHS investigations in the form of bloods and ultrasound, and then when I started work and had private healthcare I saw gynae and endocrinology (I can't remember which was first!) and I'm not 100% sure where in that process we started Metformin!
When I saw gynaecology we swapped the pill for an iud which was a game changer for me, but I certainly wouldn't entertain that in a teen (and I don't even know if they would do it)
We stopped the acne medication somewhere around 18 when it stopped being quite so intense (although they let me keep the cream for a while longer). I still got the odd flair up but by my early-mid 20s my skin had completely cleared up, and now I'm pushing mid 30s and all my friends are contemplating Botox and my skin looks the best it ever has, apparently common in those who had particularly oily/acne prone skin growing up so please reassure her that there is the odd silver lining and that she really is in the thick of it currently.
Having my first child really helped my symptoms (it took a year to conceive), they asked me to stop my Metformin at around 12 weeks and I didn't restart it after she was born as I didn't need it. DS was conceived 2 years later on the first month of trying, but symptoms did come back with a vengeance after he was born unfortunately. I had to wait for my IUD as I was breastfeeding, so tried to manage with various pills and none of them helped, so I don't think the pill is necessarily ways a cure all but it's worth trying. I went back onto Metformin last year and I still maintain for me, it is the most effective treatment I have tried (combined with the IUD which allows for period control but "natural" hormonal fluctuation which suits me better as never found a pill that didn't have side effects, it was just a balance of side effects Vs symptoms.
I did try inositol when TTC #1 and didn't think it made much difference to my symptoms, but reading these replies maybe I didn't keep it up long enough (and I did eventually fall pregnant, so maybe it did help 🤷🏼♀️)
If you are considering a pill, if you haven't already I would ask them to test her hormone levels via blood test before you start. It forms one of the diagnostic criteria (in my experience they wanted biochemical hyperandrogenism rather than characteristic) and then we had difficulty confirming the diagnosis because by the time the GP did it I was already on the pill and then was told the tests wouldn't be accurate because of the pill, and in conjunction we lost the "irregular period" criteria too because they were being regulated by the pill and they couldn't guarantee it wasn't just irregular because of age and may have settled down if I stopped taking the pill!