@rowenaz I played outside all the time when I was younger and it didn’t stop me from needing glasses. Granted, I didn’t actually wear them until I was about 30, much to the chagrin of many (including the Navy).
They tried “eye strengthening exercises” when I was young. When that failed, they tried to make me wear them when I was 6 and I refused. Same at 8, 10, 12, 15, 18, 24, 27, and a few times in between. Until about age 25, I actually had 20/20 in one eye… close up. However, my distance vision (anything over about ten feet) in that eye was 20/40, and I couldn’t reliably recognize faces at 25 feet. I couldn’t sit more than halfway back in a theatre or classroom, and driving was only possible since you don’t need to actually spot details to see a 15-foot-long object, though I couldn’t read most road signs until I was almost ready to pass them.
Sunlight won’t help much if at all. At best, it will help them adapt well enough to be outside during the day without sunglasses, but it won’t make their eyes stronger nor will it keep them from degenerating over time.
As for our tone, I can’t speak for anyone else here, but I can tell you what my personal experience is, and my experience says that there is no way around glasses that is appropriate for a still-growing child; the only real way to eliminate a dependence on glasses are contact lenses or laser surgery. If her eyes are bad then they are bad, and I don’t see stuff that didn’t work for me or anyone else I know working for her.