To be fair, this is probably the best outcome. As a former cat owner, I encourage the hose routine first. If my neighbour hosed my cat to get the point across, I would not be mad. Cats are persistent and sometimes it takes more than their person to step in to discourage bad behaviour. If the cat is out loose, also in all fairness, it is coyote bait. If you caught it safely in a live trap and relocated it to a shelter, that might be the better option. Orrrr...if she cares about her cat that much, she could keep it inside. As she seems to be doing.