Hi! We have had to quarantine 3 birds in the past few weeks, including a very high energy rooster that started fighting the others and an injured hen. I created a "scratch bin" to put in their areas and provide some entertainment. I used a cat litter box and filled it about 1/4 of the depth (to give them plenty of depth and area surface to scratch through) with bedding, garden clippings, a patch of grass (dug down about 3 inches and squared a 6x6 piece) along with the dirt, roots and bugs already in the grass clump (try to take grass from an area of your yard that she seems to like and visits often, it may help to lure her to try some of it and hopefully make her excited about scratching), I add treats and food all over inside the box. Our rooster loves frozen peas so I will push them into the dirt clump to make it more challenging. He has really loved it! Secondly, we provide them with a "kick bottle" 2x a day. Our kick bottle is just a wide mouth plastic water bottle that we drilled holes into (drill the holes just a bit bigger than the treat you want to put in there and make sure that the edges for all of the holes that you drill are smooth and have absolutely zero hanging plastic. They will eat it. For some reason (becaise, chickens...) they are very determined to try it!

Bird toys (for parakeets or parrots) are another great option, I buy mine at Dollar Tree and they work great. Lastly, I give them a fan in their area to keep the air flowing. Imagine sitting in your house with a down comforter wrapped around you (even in the winter that could become pretty miserable, fairly quickly!). Yuck...lol. These have all worked really well for us and have kept the chickens fairly happy, even when they have to be separated from the flock. In fact, our very first egg was from the injured hen that we had to quarantine so, she seemed happy/content with the setup.
I hope some of this may help you and, I will add more if I can think of anything. Also, I had a question: the vet said an antibiotic ointment with Lidocaine is ok? I've always understood Lidocaine to be extremely dangerous for chickens and have avoided it. I've read a ton of articles that say not to use it but, the vet is the pro so now I'm confused. I'm still new to this as well, we have 16 chickens altogether now, that we purchased in April because we had rescued an abandoned rooster near our home last fall and, he needed a flock. And, now we have 4 roos, meaning, we had a 70% succes rate on our wyandottes...