I have a 6 week old Cream Legbar hen that is ill and I don't know what else to do. 4 nights ago I noticed she was limping and "yawning". For 3 full days now she can't walk, stumbles and falls, keeps eyes closed unless she's startled and is "yawning" on a consistent basis. This morning seemed a bit better. She's was chirping a lot, trying to stand and actually did for a few seconds and is eating on her own. But still the other symptoms are present. I've been giving her electrolytes and probiotics by syringe this whole time. Is this Mareks? Should I put her out of her misery??? Any advice is welcomed.