Every bird has their own cup of food. Plus they all have treat bars out. Plus there are three separate bathtubs out for them to play in. Plus a big playgym with bells and gnawy things. Plus a big window they hang out in.
They have a HUGE cage and all day long I am in my office so they have the entire office area they fly around in while I am here. They can definitely chase her "away"

They are just psycho sometimes.
Then I put on the sleepy time music and they all fluff up and warble ...
So then Pinto and Santo, two of my blue birds, decided they were now rivals. Pinto sits on top of the cage like a vulture, staring down at the birds who happen to be inside. Then Santo launches herself inside the cage at the "ceiling" of the cage. Pinto pecks down at Santo's feet. Santo pecks up at Pinto's feet. One of them gives up and then wait a while and then do it again.
It was all fun and games until Pinto actually drew blood on Santo - then we of course had to get Santo calmed down and get her feet cleaned off. Everything's calmed down now, I think Santo has learned her lesson about ceiling-hanging-bat-behavior ...
UPDATE: OK I again say these birds are psycho, Santo went right back to clinging on the underside of the ceiling of the cage and gnawing at Pinto's toes, forcing her to retaliate. We have now covered the entire top of the cage with washcloths, so they can't get at each other any more

Problem solved! Until they find a new way to chase each other

Ah life with four female parakeets ...