Guys guys guys
SHE. LAUGHED. WHILE. DROWNING. THEM.
This was not to save the dogs a life of misery.
You can dunk their heads in a bucket of water, rather than simply tossing them in a river with plenty of sharp rocks to end washed up next to someone's house.
You can find some way to humanely euthanize them, if possible.
You can try to find someone who will take care of them, if possible.