How can you fall onto the tracks unless you were distracted or not paying attention?!?
I've got MS. I haven't felt my feet in AGES. I don't do well in heat (it's an MS thing). I've had to CRAWL to a cold place--in the freakin' middle of the parks--because my legs stopped working. I also have bad depth perception as well. So anything that is "obviously" a change in elevation (a step, a ramp) isn't so obvious to me if there isn't a significant color change.
I promise, I'm paying attention. I'm paying so much attention that I've stopped rides trying not to fall, knowing that no matter what I do, my foot is going to hit the edge of ride vehicle. If I'm lucky, Hubs will be there to catch me. If I'm not, I'm ending up on my bad arm, my bad knees, or my rear, depending on what angle I go, if I don't manage to catch myself. (Now I know about the alternative loading areas, thankfully.)
Not all disabilities are visible. Unless you were there--unless you were a part of her party!--you have NO IDEA why she fell, and to blame it on her being distracted, not paying attention, or texting is just plain offensive to those of us trying to enjoy the parks regardless of our physical issues!