I said I wasn't going to update, but I will!
Day 18: Washed Festia today and dusted her again. She had the worst infestation, so I just wanted to be safe. Also, I see nothing wrong with the new birds, so I will add a few "scapegoats" from the old flock in with the new flock in a few days. I will do this slowly until everyone is in the new coop. Trying to not think about having to deworm the new flock for the second time and then having to deworm the "other" flock too, but I am sure we will figure it out. Its going good guys! Very happy!