I'd put the poop in the litter and leave it there for a while every time she craps on the floor. You can try crapping in the litter yourself in front of her, maybe she'll get the message. Don't laugh, I'm serious. I had a kitten who was far too young and not weaned, had to show her how to drink water about 50 times before she got the hang of it 🙀👍🏿😻🤜🏻🤛