I had one in a broody-buster for FIVE days this spring. Like you, early in that week, I kept thinking she was back to normal, but I think letting her out (and having her eventually end up back in the nesting box when I turned my back!!) prolonged the ordeal. As long as she has food, water, and something covering her from the elements, she'll be fine isolated from her buddies. I kept mine in a cage in the chicken yard where the hens could all see each other, but there was still some pecking order readjustment when she was finally freed.