Congrats on the broody. They are sneaky like that when they want to hatch.
Turns out she wasn't broody. Only very grouchy because I interrupted her egg-laying. She usually gets super grouchy when laying an egg right before she becomes broody. I hope she isn't deciding to go broody since I'm splitting pens soon and need her for eggs. But as we all know, broodies are just so much fun!