I have a 4-5 month old silkie hen that is not doing well. She holds her head/neck to one side and seems a bit disoriented. I picked her up (she didn't try run because she's sick) and looked for any external injuries. I didn't see anything. I moved her neck gently to the other side and it didn't seem to cause her pain. I also looked for parasites and checked if there was an egg in her abdomen, but nothing. She did have some white poo residue on her feathers around her vent, but not much. She did seem a bit thin, but I saw her peck at some grass just recently. I think it's been a few days where she seems a little off, but today it's much worse. Any idea what's wrong? Could it be contagious? Thanks for your help!