I would just try your best to save her.. maybe she will sit, maybe not. I notice if i throw old towels near my chickens they sort of dig them up into a nest. If its dark she might accept anything and just go to sleep until morning.
I know it might sound extreme, but maybe just for tonight, do you have a spare bathroom or laundry room you can put her in? If its rats, she could be dead by morning.. she sounds injured nonetheless ❤❤❤