Re: Moving with a Feral Cat
Mister was our most terrible cat about putting in a cat carrier. We got Mister out of an abandoned barn when he was a very small kitten, perhaps 6wks old, so he could not be considered 'feral' but a scruff-hold would NOT imobilize him at all. He would howl, scream, yowl, growl and had his claws going everywhere. We were also fearful of being bit. The last few times we put him in a cat carrier, we had to wrap him in a towel and drop him in, after setting the carrier on end so the door opening pointed to the sky. Once at the vet and after his exam, he was very happy to get back into the carrier to go home.
After moving across country (we took the cats loose in an RV and they hid under blankets), if he needed to go to the vet I began to bring the carrier into the house, set it on the floor and opened it up when he was near the door. His curiosity would get the better of him and I'd just quietly close the door behind him. As soon as he heard the door close, he would begin to growl softly.
At one point, he injured his eye, had to see the vet weekly for more than two months and I could not 'trick' him into entering the carrier that often so I resorted to a harness and leash, which he did fine on. Once at the vet office I would put him in their bathroom until we were called to the exam room.
You may find that her aggressive nature will be subdued in the unfamiliar hotel rooms. If not, keep a large bath towel handy and just wad her up in it to put her in the carrier. Once in there she can get herself unstuck from the towel. Do check the hotel room carefully to be sure there are no places she can get to that you cannot reach her, like furniture affixed to the floor or wall, box spring mattresses she can rip a hole in and get into the bottom area.
You could also try leaving her in a room with the carrier and feeding her in it to get her used to associating it with 'good things'.
I wish I had more to offer,