Can a hen think it's a rooster?

[Mzcooke]

I am new to chickens. I have 5 polish hens (no roosters) that are about 9 months old. They have been laying for about 3 months now. I often get 3 or 4 eggs a day, but never 5. One of the hens stands on the roost every morning and crows. Is it possible that she thinks she's a rooster? I can't tell if she lays or not because they all look alike. Has anyone ever heard of this?

 

[Shabby Chic-Hens]

Can you post pictures of her?
Yes, some hens do crow, hump other hens, grow spurs, etc. they will also lay an egg in the nesting box every day.