I saw your video Sheeshshe The poor little thing. She definitely looks like she is in a lot of pain. My husband and I got our first silkies this past May (2013)
Sometimes they seemed to limp when they walked. When inspecting their feet we noticed they would get wood chips or poop balls stuck in their foot feathers. I found that coconut oil messaged into their feet feathers get's out what ever is stuck in their feet and they seem to enjoy the foot message.
We recently just got two hens from a farm that the rooster was picking on and they had lost feathers on their head and back. I messaged coconut oil on their bare skin and in a week I definitely
saw new feathers filling in. All that to say maybe messaging her leg would help your poor little hen. Hope that helps. Good Luck We love our silkies and your little girl looks like she could be a sister to ours.