This sure looks like what my hen was doing a couple of months ago. However, after staggering around she gave up and didn't try to run like yours is doing. She was in a cage so she might have tried it if she had been in a larger place, but in the cage when she would try to stand, her legs wouldn't hold her. She didn't have enough space to try to take off running. When she first started with this problem, she used her wings a lot to try to help keep her balance, like yours seems to be doing.
In this video, she doesn't look "sick". She looks like her legs won't work. She must have a lot of energy to force her legs to at least move her.
So now I have to wonder if it is better for her to continue to move her legs like this, or if it would be better if she just didn't try and rested for a few days. I have no clue. I guess it could go either way.
I don't know what to say. I guess from the luck I had with mine, I would just suggest you keep forcing the Vit. B down her in every way you can think of.
I really want to hear how she does, and I wish you all the luck!