Do you know this bird?

From A Peahen who ...

This peahen found her way into our garden a few days ago, and seems to have made herself at home. And yes, those piles on the wall are hers. I'm not sure how to discourage her from this behaviour (short of letting Electra into the garden at the same time, and the results of that might be even messier).
Anyone have any advice on how to move on vagrants?