my chicken's legs arn't working properly

[the devil]

I have a chicken that is about a week old who can't walk properly and keeps getting trampled by the other chicks. I have no idea what to do because I don't want to separate her from the others because it will be too cold. If you could give me an idea of what to do that would be aprecated.
- the devil

 

[Hillaire]

watch this video that should help