goose attached to my roosters

[LinMicMend]

I have a now 9 month old Toulouse, Lil Miss. A month ago, she lost her sister and mostly separated herself from the rest of my main goose flock. Then she flew over a 4' fence & sought out my one bonded yard-wandering pair. My buff gander chased her off even though I have 3 other young geese in with him & his goose that he seems to accept but keep at wing's length. We were letting her free range in the yard but now she seeks out and literally flanks the rooster of which ever flock I have free-ranging for the day. And she chases off that rooster's hens. Is there any feedback or suggestions on how we can help her reacclimate to being among her own kind?