I have a flemish mix female that lives outside with my hens and 2 goats,,and she's the happiest rabbit I've ever seen. She has a dug hole she lives in under the goats house for safety that she built herself. They don't ever fight,,sometimes the hens will attempt chasing her but they can never get to her cause she's too fast! I would recommend that yours has some type of shelter and protection given the chance that she needs it from weather or other predators. Or she can live in the chicken coop ... as long as she's not vulnerable at night. I've had rabbits taken from owls at night,,they MUST be protected.
I also recomend feeding her a medicated rabbit feed that prevents rabbits from contracting coccidia illness from the chicken poop. They sell it in feed stores,and actually it's not medicated,it has an additive of some microorgansm to prevent getting the illness. It's made for farmers who house their rabbits and poultry in the same building.