Here, this thread might be helpful to read through: https://www.backyardchickens.com/threads/standing-walking-like-a-penguin-but-not-egg-bound.1603782/
I'm tagging @Eggcessive and @Wyorp Rock, as they are very knowledgeable on chicken health issues.
:welcome
When was the last time she laid an egg? By standing/walking like a penguin, do you mean that she is holding her body completely vertical like she's laying an egg, but nothing is coming out? Kinda like the hen in the picture below? (This hen was not egg bound.)