The dormant ovary (technically not an ovary but an ovatestis) in a hen, may, after a condition affecting her functioning ovary, cause changes in a hen, giving her male characteristics. She will not be able to reproduce as a rooster, and genetically she is still a hen, but her body is producing androgens, the male hormone. She won't lay eggs, either, so she lives in kind of a land betwixt and between - not really a hen anymore but not a rooster either. I thought that was so interesting when I read it.
Right, it's all about hormones. The hen is just producing more male hormones than female hormones. But she is still a hen even if she doesn't lay an egg. Nothing will change that. There is no 'in-between' stage for birds.