Oh that’s awful! Sorry for your loss. I’d say Bee is probably in shock and very depressed. They are very sensitive critters and can get very depressed/lonely. I’d say probably look into getting more ducks or rehoming her to someone with ducks.
What type of accident? Did the other duck see it happen/was she there? I’d give her some sugar water or electrolytes, you can even give her some Gatorade, and try to make sure she’s eating and drinking. She definitely needs some more flock mate(s). I’d say look for an older female duck or a few...