KittenKiya, if you don't intend to keep her inside but just want a place for her to recuperate, I wouldn't do it. If you mean you'd like to bring her inside as a pet, I'd go for it! But then, of course, I'm completey biased. We thought we didn't have enough room for more than two. Then three. There was NO WAY we could bring in a fourth. And five was out of the question!
We live in an RV that is 40 ft by 8 ft. Mind you, we've taken out the "dining room" and put in cat furniture. We've emptied out cabinets so they can go vertical. We've put in special bookcases that are open on the ends so they have various levels on which to sleep or move about. We've constructed three-levels of play-areas/roadways / sleeping areas by using construction forming tubes placed between the bed and the wall in the bedroom. We've got shipskins draped over what were our bedside tables (they make VERY cozy corners for sleeping for the kitties!) We put up "windowsills" that sit on the back of the couch and protrude out far enough they can lie there to look out the window - all five fit if they're in a mood for it, LOL! We've put up birdfeeders so they've got cat T.V - as I look around the living room, I see eight cat beds at three different levels excluding the floor that are NOT human furniture.
It depends upon you, really! If you can take care of five, her introduction into your home can be made in such a way that they will all get along - eventually - and that not too much fighting will break out at first. I use Hissy's method as described in the article to which she included a link - but we do this only when they're small kittens because the only "room" in our home that's truly separate is the bathroom. That's where the babies always start out - with a box/bed in the shower and small litterbox on the bathroom floor. Of course we try to make intros ASAP - usually by having one cat in the bedroom with kitty (and us) for a few minutes at a time.
Flowerbelle was absolutely convinced the big kitties wanted to kill her for weeks (she'd been mauled when rescued - and likely by a cat). Spooky always hates new intros. It took about six weeks - two months before we let Flowerbelle out into the general home unsupervised. Otherwise at night she went back into her bathroom set-up, and whenever we were both out together she went back into the bathroom set up. Now? She loves the bathroom! It's her "safe" space. She loves getting brushed in there. She eats her kitten food in there (we have adult cats that have stomach problems, so they can't have access to her food). She doesn't like being left alone in there for long - too anxious to get out and play with all her pals. Even Spooky loves her now, and bathes her and curls up to sleep with her. But it did take about two months before Spooky would not rush at her (though it was only about six weeks before Flowerbelle was big enough and confident enough to hold her own against those "in-your-face" moments. There was very little hissing ever involved).
Shelly, our 14 pound (thin but HUGE) alpha and Flowerbelle have become fast friends. She'll run and jump on him - literally! She tries to sit on him, they roll around - they'll even get "into" enough you get ears back sometimes. But they never really mean it, and he has NEVER hurt her.
But we took intros slow and long, and we kept her basically segregated from "the crew" for several months, as I explained
My point is - if you have the time and patience to do it right, space isn't really the issue.
Let us know what you decide to do!