Just going to forward this with reasonable people can disagree on this and I am probably not going to give you an answer you want to hear.
Eh, I know that you're emphasizing she's adapted and living happily, but you're still playing into old notions of blindness as a curse which goes all the way back to Tiresias. This goes *really* far back and is sort of a tired old trope that no doubt lingers in how sighted people treat blind people today (there's an
$1 that touches on this). There's a lot of academic literature on this--blindness as metaphor comes to mind.
You also are, effectively, creating blindness that isn't blindness--she can see with a simple fix. It's not quite a miraculous cure, but it's close (you describe it as "blessed"). Again, it's an old trope.
Also, if you go blind at six and regain some form of sight at sixteen, you're going to seriously have issues interpreting it. It's not an on and off switch. You can't just regain sight and go live as a sighted person.
You're not offending me, but you are playing into thousand year old notions of blindness that have made some blind peoples' lives demonstrably more difficult.