If she shows no real interest in the chickens, that is great. If she does, or wants to chase, the thing that worked well with my young Maremma who was chasing and unintentionally killing chickens was to lay him down and allow the chickens to walk on him. Everytime he lifted his head or tried to avoid them, I corrected him with a loud "NO" and pushed him back into position. I don't know if it humiliated him, or just got him to understand the chickens were a priority to me, but he has never mauled one since and has been faithfully protecting them for a full season. HE and his brother have established a 'no fly zone' in the back yard where they free range and tend to lay wherever the chickens congregate during the day. I am sure your girl is gonna be great