Ron Weasely found Rosmerta's body, bloody and burnt in what remained of the makeshift triage unit on the grounds.
The triage was abandoned before the battle even finished, its position became indefensible as the battle progressed. Many died there. Eloise Midgen-died nursing Susan Li who's stomach had been blown open due to a blasting curse. Mylor Silvanus, hopefully dead before the giants tore the triage apart. Geoffrey Hooper felled with a killing curse while trying to protect the wounded. Mafalda Hopkirk, another patient in the triage, unable to move from her makeshift cot before being struck with an entrails expelling curse.
All the deaths were gruesome and horrible and sad. But Ron Weasely found Rosmerta's body, and that left its own mark.
He didn't know how the others had missed her before. Her body lay just outside what remained of the triage tent, curled on its side. One side of her pretty face (that had so entranced him as a child) was gone, blown clean away. The other side was untouched.
She could have been a little doll she was so pale and still, her dress moving with the early morning breeze. A little broken china doll, just waiting to be put back together. Waiting for him to put her back together.
But Rosmerta was missing one vital piece. It was gone into the void, into the dark. On, as Harry would say.
And so Ron couldn't fix her. And Rosmerta stayed broken.