I think the eggs are no longer viable. Even if she didn’t start brooding until a couple days after laying. Could be an infertile male/female or the heat may have killed the eggs. My understanding is temps about 105/106 will spoil the eggs. I had the same issue with the first clutch, likely due to a cold spell for the first 2 eggs. They never did hatch and momma left them in the nest with the one fledgling (who I see every day now helping to feed the second clutch). It’s tough to face, but happens in nature all the time. You are just experiencing it first hand.
