She seems to be shaped like a game bird of some type. Try posting a picture of her in the What Breed or Gender forum. I'm sure someone there can help you figure out exactly what she is.
And welcome to BYC!
I only kept 3 hens. One of the pullets is now bigger then the other one. Momma hen is not much bigger than the biggest pullet
The biggest pullet seems to be bulling the other one. She flies over & makes the other one fly away. I don’t see any wounds or blood. When I close the coop door once they get inside the bullying one is “ complaining “ loudly.
should I be concerned & if so, what do I do ?