The water hose is an intriguing idea, and might be a good way to manage this in a day or so. Tonight she again will spend it outside the coop, I think (the weather is perfect). And I may make moves of engagement tomorrow. She and he were going at it across the wire yet today, but he seemed to be...
Similar scene with mine. Yesterday I have just inherited a sweet new hen (3 year old barred rock) to add to my flock of 5 + 1 Rooster, all yearlings. I put her in with the others in the fenced yard (perhaps 100 sq feet,,in the woods). The new girl was quickly attacked by the dominant hen, but...