Rufous vs Annas

We have our first Rufous female, and boy, does this little girl take over the greenhouse feeder. For some reason, our year around Annas do not permit two at a time at any of the four feeders which are placed one per side of the house, yet I see all sorts of pics on the web of six on a feeder with others waiting their turn. Never will understand this and they won't listen to my pleas, lol. Mama has been here for several years and has her own feeder where she nests on her side of the house and she finally is permitting her own children on her feeders. Anyway, this new little girl is taking over the greenhouse. The Anna's that normally feed at this particular feeder are having a hard time getting anything at all. Any suggestions? Put up another in the same area? Don't worry?