I'm listening again to the part about Mother's day, with my ear up to the laptop speaker.
At one point TD mentions that BM was in Denver, and asks how long it was before somebody noticed that she was gone. I hear BM say, "....Well, it was Mother's Day, so..." long pause...(it almost seems like maybe he was checking his phone and got distracted momentarily?) "We uh, ...we had two daughters, who were coming home from a trip, and I had that job in Denver that I wanted to get started, on Sunday wanted to set it up...because my workers were coming in Sunday night. They [we?] weren't going to work Sunday, they [we?] were going to work Monday, but me being the owner, I wanted to get things lined up..." [can't quite make out this part, something about the workers being able to work right when they got there Monday morning] "...so, I told my wife, I said listen, the girls are going to be home, they want to spend Mother's Day with you, do you mind if I go get started? She said that's fine " [something about bikes?]...."Anyway, that's what we thought was going to happen. The girls were running late, so they texted Happy Mother's Day, she didn't text back..." Then he goes on to talk about calling the neighbor.
So I guess he did give some kind of detail about Sunday. It sounds to me like he's saying that he left on Sunday for Denver to set up this job for his workers to get started on, and that he asked SM if it was okay for him to go and get started with that job, since the girls were coming home and wanted to spend Mother's Day with her, like they would have a girls' day.
So with that line of thinking, the daughters were actually expected to be arriving at the Morphew home to spend the day with SM. So maybe that's why the immediate worry about where she was, since she was expecting them home, but didn't respond to their text that they were running late and Happy Mother's Day (no he didn't say they texted her they would be late, but I'm assuming they would have).