Help with leg injury - video but not disturbing.

I got this hen from a local woman who couldn’t care for her. I’d like to try my best to rehabilitate her. She said she came home and the hen appeared to have a broken leg it was all sprawled out. She had her for a week and a half injured before I got her. I believe she’d been laying on the ground for that time and could not stand even on her seemingly non-injured leg. In this video she has no wrap or splint and she keeps both her legs way up to her chest and when she is on the ground they stick out in front of her. She has open wounds on her elbow joints where she was laying like that.

I now have her in this harness 24/7 to keep her off her legs and have makeshift splints to keep her legs stretched out. I’m wondering if anyone has had a chicken do this and what might have helped? I’m really hoping she can make it through and walk again she’s so stinking sweet.