I have GA and would be willing to speak to your daughter if she is up to it. I am 35 and was diagnoised when I was around 12. I can definitely relate to being done with doctors and diets. To be honest, I still struggle with diet. I try to be vegeterian mostly but I am not following a strict diet or taking any supplements though I should be. I grew up in Boston and saw Dr Berson at Mass Eye and Ear. I have been living in San Francisco for 10 years and seeing Jaque Duncan at UCSF. I developed cataracts about 2 years ago but we are currently waiting until they progress further before having surgery. I got a sabbatical from my job last year and I am currently travelling in Latin America while I still can travel independently. I stopped driving at night due to vision loss but luckly still have pretty good central vision.
Not sure best way to approach your daughther or get her more "motivated" so to speak. I still struggle with acceptance of my vision loss and acceptance is definitely a moving line. Some days are better than others. Too be honest, I like to think that GA made me appreciate life more because I know one day I might not be able to see the ocean, a sun rise, mountains, friends, family, etc and I try to appreciate life moments and take it all in. But that is also coupled with the thought if I am going to go blind whats the point of following the diet and I should just live my life to the fullest while I can and deal with "it" the blindness later. It can be a tough burden for sure but overall I am still pretty positive with life but struggle with following a strict diet. I share these personal thoughts to maybe help you understand what your daughter might be struggling with but we all deal with it differently and she could be in another space. I did see a vision loss therapist for a bit. It helped to vocalize some of my thoughts and concerns but since I can still do most things by myself I decided to stop and maybe if my vision gets worst I would go back.
I think you added me on facebook but here is my email if you or anyone else wants to connect. firstname.lastname@example.org
Interesting about the marathon, I am training for a half marathon in Colombia and thinking about doing the boston marathon in April. My dad ran it a few years back and raised money for boston mass eye and ear hospital but it would be awesome to find a GA specific doctor or fund that we could raise money for directly.
Hope all have a great day.