The initial interactions between the two females were stiff and each kept an eye on the other. They weren't going to be friends but seemed willing to leave each other alone, or at least watch one another from a distance.
For the next week I let Willow work on pasture during the day but placed her back with the rams overnight. I was okay with how this was going and felt hopeful that finally we could let Willow join this pasture pack for good.
In the end it wasn't fights between the females that ended Willows stint on pasture and left me disappointed. I want Willow to have the increased work and the companionship of the other guard dogs, both of which come with being out on pasture. But Willow's true colors came through and once comfortable on pasture she began to leave it. She took to wandering, a practice she learned as a younger dog from a male dog which we no longer have.