I think this is one of the sweetest things I've ever heard. Luclin999, I don't know your background, but you obviously have had no chickens recently. It just warms my heart that you would adopt this little chicken.
Can you close her in the house you built for her? It's not uncommon to keep chickens in their coop for several days before letting them out, so they know where "home" is. If you can close her in there, she won't be happy. But keep her in there several days, and she will learn to think of it as "home". Once you enclose a "run" for her, I would allow her out there, but not in free in your yard, for at least a couple of weeks before allowing her to free range. She needs to identify with her run and coop as "home" so she will naturally return to them at night or in times of danger.
You are wonderful for taking in this little orphan!
Penny