House training old cat?

Cats like to bury their poop. Make an area for her with sand or very loose dirt. They also sell Cat Attract, its to make cats use their litter boxes, but there's no reason you can't use it outside where you want her to go potty.

I have never heard of a cat who has to always go outdoors to potty, most cats do use a litter box.

Put a cat flap on the door, then put tray outside.

Everytime the cat wants to pee/poo, you put the cat outside so that the cat associate the tray with being outside.

Try the Tidy Cat scoop kind it usually works for my friends cat!