"I started feeding them to save birds and it morphed into something bigger," she said.
She has formed close bonds with the Holistic Vets which desexed trapped cats for free and the Animal Rescue and Rehabilitation Centre. Even Bob Kerridge, from the Auckland SPCA, supported her efforts to educate people who abandoned cats and left them vulnerable to miserable deaths from cat flu.
"I am called the mad cat lady - it is not a label I aspire to," the former Bay of Plenty Polytechnic nursing tutor said.
Ms McLeod has distributed 50 flyers in a bid to find homes for some of the cats, which she said would be ideal for orchards with pest problems.
"I'm extremely anxious about these gorgeous animals because I can't take them with me. If I can't find a home for some of them, they will have to be destroyed."
Sadly, her letterbox drop did not draw a single response. "The hurtful thing is the indifference, I would rather people got angry."
She fed the cats every night on a mixture of cooked rice and five big cans of pet food in winter and more expensive biscuits in summer, costing $300 a fortnight. Her efforts to improve the cats' lives extended to buying little shelters.
"It's cost me a fortune, I'm probably naive and stupid," the nurse and former ambulance officer said.
But it seemed to work because the bird life had flourished and there were a lot more avocados from the cats killing rats and mice. "I have taken up their cause to educate people."
Sue Mackey, of Holistic Vets, said Ms McLeod had a heart of gold and they had done all they could to help: "I am really upset for her about where this could all end up."
But it was a big ask to find people willing to take on the cats, which would be desexed. They could not be left without someone to look after them once Ms McLeod left, she said.