I thought I should update this, since I got a reply on it.
I didn't have the heart to put down this chicken, Henrietta, she is one of my favorite hens, definitely a pet and well I have become way too attached to her, I know.
So I tried putting her legs back in and stuff but really I just think it was broken and I really dont think I ended up doing anything helpful for her aside from seperating her from the others who would've pecked her to death.
I put her in an extra large dog crate, and gave her fresh food and water every day. Dragged the giant cage into the fresh, shady air in the daytime and back into the barn every night (which was too hot during the day, she would pant). Luckily it was summertime and I didn't have to keep her in my house. I used hay for bedding so she always had a soft place to lay and she basically didn't move much for the entire summer. About halfway through, she had started limping around her cage a little bit. By about July/August we let her out into the yard a little bit for short supervised periods, (cuz she couldn't get away from dogs, other chickens etc). By October I tried putting her in the coop. I have to admit I was scared to do it. I refused to put her in the coop with the rooster who I think broke her leg in the first place.. just with a few older docile hens and two young ones.
I made her a nesting box with a very short roost on the floor which she used for a short time, but before long she was on the lowest roost and now she's up on the top with all of her friends in a tight warm little row.
Aside from not being able to run, and having a noticeable limp, she is very well recovered and comes to meet me when I pull into the driveway. I open my car door, and there is my little Henrietta, clucking up at me. I'm glad to have her. I know she's old and her time will come, but I'm really glad it wasn't last April because of a stupid accident.