Pullets won't get out of the rain.
My girls are the same way. They were young and terrified of my big rooster for the first month, so I let them figure it all out by squabbling in the back. I also thought they'd hurt themselves in the coop. Now the rooster is their big papa, but can't round them up when it starts raining- He just lays on them!!! .. . So, last night after they all went to bed, I filled up their coop with water and food, and lots of basil treats(I tie it to coop so they can keep busy nibblin, plus I have way too much). I woke up at an amazing 8am-instead of rooster screamin 5, and ran out to coop to see why they were so quiet! Basil was gone, and they were all perched together. It was super cute. They are also getting close to laying age, so I didnt want them to hide eggs in the bushes.
It was just really nice that everything finally click! A perfect morning. Ive been having some serious learning experiences since my first baby chicks. So.... I think you just have to put them away. They will throw a fit, but just walk away. . . They will settle down after a bit, I am sure of it.