It is great that Jonas just sat and watched while Rob worked. It will make it much easier for her now that she cannot hide and is forced to observe and be out in the open.
As for bringing Cavendish in and the wagging tail and purring: You have to be careful with wagging tails in cats. In dogs we associate a wagging tail as excitement and happiness. In cats a wagging tail is often a sign of agitation or uncertainness. Also purring is often present in a stressful situation. My cats always purr at the vet and not from excitement or happiness, but from the stress.
It might be time to go ahead and start scent swapping with the cats. You can get a few clean wash clothes or rags and wipe each cat down. Be sure to get under the chin and the pads of the feet as these are where the scent glands are located. I know you can't wipe Jonas down, but is there a blanket or something she lays on that you could bring out to your resident cats? Bring the wash cloths or rags into the room and lay them out for Jonas to smell. Hopefully he will transmit some of his scent onto them too. Allow your resident cats to smell the blanket or bedding Jonas has been on. Maybe allow them to smell the shelter you had for Jonas.
If you have a baby gate, you could get one and put it in the doorway and crack the door. Have one of you on each side of the gate. Bring one of your resident cats ( only one as you don't want it to be overwhelming). Choose the cat that is most laid back. Jonas may not react and the person inside the room, may need to leave to the other side of the gate. Just observe. You are looking for reactions. You want positive reactions. If you see or hear any growling, yowling or hissing then this is way to soon for sight visits. It just might be a trick to see if Jonas would be motivated by another cat. Just be sure you are present in case your cat would try to jump the gate. I used a cheap wooden screen door from Lowes. I attached it to the door with tension rods. It was a pain to move, but easy to set up. It allowed the cats lots of sniff time. I did keep a baby gate in the door way for extra protection. I do have a picture of this set up if you'd like to see.
I wonder if Jonas hung out with other cats while living on her own. She may like companionship and sometimes other cats can be very motivating to help a cat socialize. It just depends on the temperment of the cat aligning.
As for bringing Cavendish in and the wagging tail and purring: You have to be careful with wagging tails in cats. In dogs we associate a wagging tail as excitement and happiness. In cats a wagging tail is often a sign of agitation or uncertainness. Also purring is often present in a stressful situation. My cats always purr at the vet and not from excitement or happiness, but from the stress.
It might be time to go ahead and start scent swapping with the cats. You can get a few clean wash clothes or rags and wipe each cat down. Be sure to get under the chin and the pads of the feet as these are where the scent glands are located. I know you can't wipe Jonas down, but is there a blanket or something she lays on that you could bring out to your resident cats? Bring the wash cloths or rags into the room and lay them out for Jonas to smell. Hopefully he will transmit some of his scent onto them too. Allow your resident cats to smell the blanket or bedding Jonas has been on. Maybe allow them to smell the shelter you had for Jonas.
If you have a baby gate, you could get one and put it in the doorway and crack the door. Have one of you on each side of the gate. Bring one of your resident cats ( only one as you don't want it to be overwhelming). Choose the cat that is most laid back. Jonas may not react and the person inside the room, may need to leave to the other side of the gate. Just observe. You are looking for reactions. You want positive reactions. If you see or hear any growling, yowling or hissing then this is way to soon for sight visits. It just might be a trick to see if Jonas would be motivated by another cat. Just be sure you are present in case your cat would try to jump the gate. I used a cheap wooden screen door from Lowes. I attached it to the door with tension rods. It was a pain to move, but easy to set up. It allowed the cats lots of sniff time. I did keep a baby gate in the door way for extra protection. I do have a picture of this set up if you'd like to see.
I wonder if Jonas hung out with other cats while living on her own. She may like companionship and sometimes other cats can be very motivating to help a cat socialize. It just depends on the temperment of the cat aligning.