How long did she stay off of the eggs for? It's essential for a broody to get off of the nest
everyday to eat, drink and do her business. Maybe take a dust bath as well. Usually they're
off the nest for 15 minutes on average. Give or take a few minutes.
What kind of signs is she giving you that she's broody? Rolling eggs underneath her while
on the nest isn't a significant sign that she's broody, it's just nesting instincts. A bossy hen
with ruffled feathers, looks like a balloon, does that broody cluck, & Sits on the nest all
day - is your average broody hen.
If she was giving you all the signs of a broody, and is staying off of the nest loads longer than
she should, I'd suspect she isn't actually broody. She just thought she was. I recommend
letting a new broody set on fake eggs for a week before putting real, fertile eggs underneath
her. Why? Because they often sit for a day or two, then decide they're not broody.
First time broodies often aren't good sitters, and will not sit through-out the 21 day incubation
period, or will get off the eggs multiple times a day.