As long as she can go in and out of the coop at will, she'll lay her egg when she's ready. Because it takes more than 24 hours to make an egg, each day (if the hen lays daily) she'll lay it later and later. Then, she'll take a break for a day or two and then start again. So, there's no consistency with laying time.
It sounds like there's been a lot of stress - moving, a rooster, heat... If it's very hot, and even hotter in the barn, she might not want to go inside to lay at all. Yet another reason for good ventilation and having shade over the coop! In any event, I've a feeling she'll start laying again and be fine.