I don't think that is all the way broody yet.
If she puffs up and doesn't leave the nest box for a long time than she has gone broody. This may be the be just the beginning of the broodiness.
I recently had a hen go broody and she didn't leave the box to eat, drink or go to the bathroom! She will stop laying eggs, so I would recommend getting another nest box for her. Keep it out of the way and in a quiet place in the coop. Try to take her out once a day to eat and drink.
We still had a fake egg in the nest box and she must have thought it was her egg because she got very distressed when it somehow disappeared.

(it did break her broodiness pretty quickly, though)
If you have more questions please ask!!
:yiipchick
Hope this helps!!