Beautiful writing! But it's your end note that I want to address first, because it resonates with me so strongly. The fact that Elwing had already survived a Kinslaying, and yet provoked another one, keeps boggling me. (I can handle the "she abandoned her children" thing, even as a mother, but I can't get over the fact that she could have prevented the whole thing in the first place!) It's heartbreaking to consider that some sort of peaceful closure could have been reached at that point, and instead, there was more bloodshed. Of course, after Doriath, it is also understandable that Elwing might take a sort of "I'd rather die than give you what you killed for" stance, but it is not exactly sensible.
But this is not the place to rant about that (especially since we seem to be on the same page)! Instead, let me express my admiration that you nonetheless depicted Elwing in a very sympathetic manner here, neither as some kind of saint nor as a monster who spares no thoughts for her people and her children, but as a highly conflicted woman who has to deal with the consequences of her choices. Well done!

"There have always been rumors they survived, fled into the forest, but never was any proof found."

That line was really heart-wrenching! It seems realistic, too, for rumors like that to be around.

Great story!