I've been bottle feeding an orphaned kitten since 10/22/19. She was a couple days old when I got her so she's 5 weeks old now. I've been calling her Spicy. This weekend I introduced kitten wet food and a litter box. I got the Royal Canin Mother & Babycat food. I set up a litter box using one of the cardboard cartons from my 2 senior cats wet food cases with non-clumping litter. I set her in the box after eating, but she didn't understand. She rolled around in the litter, chewed on the edge of the box and tried to eat the litter. Someone suggested using a paper plate so I tried that, but she just pounces around in it like a sandbox. She pooped in a corner of the bathroom I was trying to train her in when I went to check on the other cats. I put the put the box in her kennel overnight and she pooped right in front of it on the towel I had underneath. I tossed those poops in the box to show her that's where it's supposed to go, but she still thinks it's to play with. My 14 year old was 5-6 weeks when I got her and she took to the litter box immediately. My 13 year old was 6-8 weeks and he understood the litter box as well. What do I do with this girl?