One of my ISA Brown pullets, Henna Maroney, is taking a few steps and then falling to the ground, usually when near another hen, Hen 10. She had blood on her crest this morning and was crowing all through the night, and is laying eggs without shells. I rescued the three from a battery hen factory, where you can purchase the hens before they go into the cages. They had all been debeaked when I bought them. Is she getting attacked by Hen 10 (or Henneth the Page?), leading to her strange behaviour or could she be sick?