Its a nightmare for young being cage rested but mental stimulation is a must. If you are busy in a room take the cage in. There is nothing worse than staring at the same four walls for weeks on end. Mental stimulation watching and looking around a different room can help with boredom.
Use a feed dispenser instead of a bowl. It will take much longer to eat the meal, especially if you use wet food that can be packed into the dispenser so the kitten must spend the time figuring out how to get to the deeper area. A meal becomes a half hour entertainment instead of five minute stomach fill. The Kitty Kong is ideal for this
A little box to sleep inside is comforting but without the roof so no climbing for that pelvis. A small catnip toy that is grabable with from claws is also good. There are lots and kong do some great ones of these too. Keep away from fast moving items like balls as that can cause a sudden jolt on the pelvis or hind limbs. Change the toy to a different type after a couple of days and only pop it in the cage for an hour at a time otherwise it becomes an item of furniture instead of a fun new item. Spend the hour playing with kitten with the toy so she still gets the human contact she needs.
Training little tricks can be done with kittens as well as puppies, 'sit' or 'give a paw' takes concentration and mental energy to learn but for a treat and to break the boredom kittens love it.
Have you been put in contact with a registered animal physiotherapist. They are worth their weight in gold. They teach you to do massage and exercises on the limbs which speed up the healing processes and keep the strength in those muscles not being used so the kitten will recover much more quickly. Ask your vet to refer you as you need to be referred, under regulations physics can only work under the referral of a vet. It is also stimulation and contact for the kitten so again reduces boredom.
Hope some of this helps. Good luck with her hope she is back on all four feet soon


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