Hate to ask, but did something happen to her?They don't have a momma hen. And they're too big for her anyways.
Carport should be fine with some bedding on the floor. If they're standard size birds with normal feathering they'd probably be old enough or close to old enough to be without heat but if they haven't been acclimated (i.e. you had them indoors) you'll need to work on that first.