I am pretty much a hermit. I've only been out of the house a handful of times since New Years. (Chronic illness)
If my husband came home and I wasn't there, he would for sure worry that something bad had happened. However...I just cannot see him calling in the police lickety split. Human nature is, IMO, to think, "There must be a reasonable explanation..." He'd call my mom, my friends (even though I rarely go anywhere with them), he might even walk around the neighborhood looking for me and if he was getting frantic, knock on neighbors' doors to ask if they'd seen anything.
I would like to know what time she called the police. I wonder if she first walked/drove around the neighborhood, asked neighbors, etc. before calling.
If she called right away, I feel that she must have had reason to think something bad happened. Maybe she saw the blood, maybe there are other 'bad signs' that LE hasn't released to the public. You gotta admit, they haven't said much at ALL in this matter.