for a child younger than 4, what she did is understandable. they don't know better at that age, and need to be taught how to care for animals.
if she's older than 4, she's disturbed and needs to be punished, because that's horrible and shows that she may not have the ability to care for animals. i'm not trying to be mean, i'm just saying it like it is. :/ she needs to be punished for killing the fish, and needs to be taught how to properly care for ANY animal, be it a dog, cat, horse, or fish.
it bothers me when children show no remorse for killing animals. >.>;