Same here, it makes me cry on the inside or very sad. In my Equestria Chronicles spin-off Dimensional Rim my OC Arthur R Hanson has a nightmare like this and it nearly happens, but I plan to have it thwarted how I will not tell for I don't want to spoil it.
"No parent should have to bury their child". This reminds me of the scene in The Two Towers where Theoden has just buried his son, and I think it applies to this quite well. I know its Celestia in the picture but its her parents( espescialy her mother) who are greiving. And now she'l never know that she whould have ben a big sister(and now that sister will never have the bonding time sister's should have.
Even without the story this would make perfect sense for when she finally passes on. Maybe Celestia would put a spell on her to make her look as young as the day she became a princess. And maybe the samething for the other element beares. And why not make look as happy as she ever was.
there is only like a few sentences to read as far as I can tell, nothing very hard or anything. (by the way, english is not my native language as well, but if you keep on learning you can be really good at it )