Silkie sits alot and high steps

[papita]

I recently got three four month old silkies. I noticed that one sits alot while the others walk around and play. When she tries to walk she takes very high steps and takes her awhile to actually put her feet down. It takes time for her to get where she is going. She also does alot of backing up. Her legs do not stick out in the front or back and her wings are fine. I have checked her feet for mites, sores and they look fine. I started her on save a chick electrolytes. Has anyone had this same problem or know what it could be?

Thanks