I seriously doubt her cat was run down intentionally. She needs to take responsibility, tend to the animals in her care, and keep them out of the road. Parents should take responsibility as well, and not allow their children to play in the road, either.
It was clearly a bike lane.
Not a “cat lane”
I have known people who claimed that they aim at any animal that they see in the street. A person would have to go out of his way to hit an animal in the bike lane, where it is illegal to drive.
After the crazy cat lady had her cat’s funeral and calmed down, she did change her sign to “I watch for your kids, so please watch out for mine.”
But her neighbors, and certainly any strangers driving through the neighborhood, are under no obligation to look after any of her pets that are running wild. That is her job and responsibility. It’s sad, but mischief as well as accidents happen to outdoor cats.