One of my four girls, Laya, laid her first egg 8 days ago. We've gotten a total of 5 eggs from her since then and 3 of them were laid the last three consecutive mornings

I think my Barred Rock, Peep, may be laying out in the yard somewhere. Yesterday evening, I heard the egg song and I went outside and couldn't find Peep anywhere. She's very good at camouflage with her black and white speckled feathers!
So this evening, I'm going to try returning them to the run around 6:30 instead of letting them stay out til bedtime. We shall see if that works!