Reddit mentions of Pet Trex 30" Playpen for Dogs Eight 24" Wide x 30" High Panels

Some dogs love crates, some dogs hate them. I have both kinds. For my dog that loves his crate it would be cruel to deny him that space. For my dog who hates the crate it would be cruel to force her into one. There is dispute as to whether dogs think of them as dens or they just like having their own space where they can remove themselves from activity. For me the dog gets a say in the matter.

Rescues can be nuts. I would find another if it was forbidden to try crate training and using it for a dog who likes it. I you said you'd use a crate no matter the dogs comfort level I could see their point. A middle option is using an x-pen. It gives a dog more room if they don't like a crate, but gives you a chance to contain a dog who is destructive or not yet house trained. If the rescue has a dog you're interested in you can ask if they'd be fine with this compromise.

This is a x-pen.
https://smile.amazon.com/gp/product/B00F97RJH6/

Could start by just containing them to a certain room at a certain area. We transitioned pretty early from a crate to one of these and then eventually just let our dog roam free and it all worked.

If you’re ever running out for like just an hour you could leave her and see how it works out. Build up confidence to leave her out for longer periods of time

Xpen! Think something like this

The ones for large dogs are nice because they’re usually tall enough and big enough.

Edit: also in agreement with Dinka’s links

https://www.amazon.com/gp/aw/d/B00F97RJH6/ref=psdcmw_3024198011_t1_B000H8YTJI