My silkie hen approximately 6 mos old, wasn't feeling good, just setting around, she could walk but didn't feel good and wasn't eating. I brought her in the house she got progressively worse until she can't hold herself upright, she runs backwards until she's in a corner, then eventually she will be on her side. We are on our third week of this, at first she wouldn't eat, but i and fed her and she's had antibotics. Now she eats and drinks, but no improvement on the legs.. Got any ideas? What now?