Ok, maybe, but still, it just, she will still be that old mare revived and just appears younger than she really is. I think it kinda cruel. Just let the old mare die, than she will be in a better place, and if there is somepony like her born, at least, it is still a different pony, just same personality. She might look different, though.
This may look cute, but it's really an act of horrible cruelty. Celestia knows Fluttershy will eventually discover that her gift is simply something inherited from her mother who left Fluttershy for dead after she realized her daughter's wings wouldn't mature properly.
And i applaud that. Crush those dreams, Celestia! Equestria needs some more despair!