She may not be completely broke of her broody mood, yet. I've observed that my own broodies will occasionally come off the nest to do things, then go back in the earliest stages. Especially if it's hot outside. There comes a point in their broodiness, where they won't come out for anything, but they seem to just toy with the idea for a week or maybe two before really committing. That being said, as long as she's taking care of herself, it might buy you some time to decide what you want to do if she does indeed commit to sitting.