Our daughter was diagnosed at age 11 with Fibro. (She is 22 years old now)
I understand your shock. There is very little info out there for parents; extrapolating how the disease process works in a 65 year old grandmother isn't always accurate when you are dealing with a teenager.
The main thing you both need to know is this: It isn't life-ending. She can still do all the things she wants to, but she may have to do some of them differently, or more slowly, or at different times of the day. This doesn't just apply to WDW; it will hold true in all aspects of her life. You will (both) learn to adapt to this new "normal", and in time you will find the little tweaks that will make her as comfortable as possible. In time, it becomes second nature. It doesn't make the symptoms go away magically, but you will begin to feel more like you have control over your lives again.
Wheelchairs, Rollators, even the "Junior" version of
this scooter are all things we have tried over the years. Her custom Ti-Lite chair is just about at the end of it's useful life for her; she now finds as an adult that the
scooter works better for her overall. She and I now have a "matched set" of scooters due to my own health issues.
Preventing "flares" is key to quality of life - and controlling them once started - is an art form. Because they are still growing, and hormones are dumping in at a scary rate at this age, you have all the "fun" of normal teen angst paired with fibro. It can seem like punishment at times.
So, to your daughter, I say this: Fibro sucks. I'm really, really sorry. But you can't give in to it - you have to hold strong, and keep your head up, because if you don't, you will regret it. We don't believe in "no pain, no gain" at our house - but we do know that sometimes you have to find a way to push past it long enough to do the things you want to do. Yes, there is a price to be paid the next day (or two or 10) but every time you do it, you win - and the fibro loses.
You will have to try and explain your limitations to your friends, and to whoever you date.
Spoon theory is the easiest thing we have found to explain to people not familiar with how fibro affects you.
And to you, Mom, I can only say that I know how hard this is - to watch your child struggle, and live in pain is horrifying. To know that there are drugs available - but only once she reaches a certain age or growth phase is equally horrifying. I know you need to grieve at the thought of all of the ways this will impact her life, but it is important to not let it rule your or your family's world completely. As unhappy as this is, there are always, most certainly, other folks out there who are dealing with far worse burdens, day in and day out. Our family's motto has become "Normal is just a setting on the washing machine".
It gets easier, I promise.
Welcome to Holland. You aren't alone. It's a strange new place, but I promise, in time, it gets better.