Baby girl has plenty of time to enjoy her new chick chicks.Can't tell from photos but does your pen have bird netting over it? My 7-lb Marans easily flew out of a 7-ft tall enclosure. We got a big roll of bird netting from Lowe's - it comes in all sizes and does a good job of keeping out the lice-infested wild birds out of the pen.
Put a bench or a plywood plank on cinderblocks in the pen so the hens have a place to snooze/hide under during midday. Hens spend all their time outside the coop except to lay their eggs or roost and they love little hiding places.
I hope your DD has many years to enjoy her chickens. I loved growing up on a farm with livestock!