I have a black silkie that acted very strange today. She would walk three steps and then lay down. I was throwing out treats to the flock (12 hens) and she was with them but she was laying down while she ate. Then tonight she couldn't get up the ramp to roost with the other hens. She barely got to the first step and just sat there flayling her wings as if she didn't know how to walk up the ramp. She's been walking up the ramp for months. She is just of age to lay eggs and her sister has been laying normal eggs for about a month. I checked her vent and it looks normal, but she is obviously not acting normal. I have only had chickens for about 7 months so I am new to any issues with hens when they begin laying for the first time. Any suggestions or maybe other problems that it could be. Thanks so much!