OK, here is the video. Thank you for looking.
the way she can hold herself good but then tips a touch and catches herself with her wing is very similar to both of the hens I have lost to different leg injuries. Both of my hens were no where as good as her at standing up correctly though and when on of my injured hens would tip a touch it would be a complete fall. As long as see is eating and you are sure of that (some hens pretend to eat) she should not be losing weight. Once she starts to noticeably lose weight, it is technically past time to cull. Which each of my hens that had a leg injury I waited too long clinging on to hope. I did better with the second one.
My recommendation is to get her in a pen of her own and monitor the food and water she is eating and drinking. If you have the scales I would try weighing her each day at a similar time too just in case she is hiding food instead of eating it. That is what my second injured hen did for her last 2 days by the looks of the food pile I found after I cleaned her pen.
Patrick has had success with his hen recovering from an injury but so far my hens get the dying injuries.
Another thing to keep in mind is how much effort you want to put into helping the hen. If it is a pet, I'm sure it will have earned a lot more effort than an $3 farm chicken. I have some chickens that I want to breed, I would give them more time and effort than a barnyard mutt chicken that I kept for eggs only.