In the South we have birds who lay in the open like that and the eggs look the same. It is a killdeer bird. They will squawk and lay down and pitch a tantrum if you get near their nest. Maybe the same bird you saw. Interesting no matter her type. The flowers are gorgeous. Those very tall blueish/purplish spikes are digitalis. They would bloom in the Fall in Tennessee. Loved the mass planting of Hydrangeas and those orangey Crotons. So Pretty!