A few weeks ago I posted a thread about my one of my hens who had foam in her mouth. Is disappeared the next day but just this morning I looked inside her mouth and saw this yellow gross stuff growing in her mouth! In was going down her throat and on the sides of her mouth. She's 7 years old and I don't expect her to live much longer but I don't want her to be in pain or be uncomfortable. We gave her water with ACV because she was really thirsty. She's talking fine but she's acting a bit slower than she used to. I read that this might be canker? What can I do?