Freedom - how wonderful!

Might I suggest you borrow a dog cage, and cover it with a large blanket. We used to do that at a boarding kennel I worked at for overflow, and it kept the cat from freaking out and feeling exposed.

Plus, it is big enough you can get in with Ally and bond with her. And the others can sniff her, they can all get slowly acquainted.

Maybe tell your dad you are FOSTERING Ally.