Great questions. Hope you don't mind my going over it in my reply how I'm understanding it so far. I've wondered all those questions, too. Why the family would come looking for her on Saturday and decide it required further searching and then reporting her missing.
It sounds like Maya's family were close, and had a group chat set-up. and I guess they used it to stay in regular contact and steady communication with each other. No one could get a hold of Maya on Friday. Why that was so strange it set off alarms tells me she usually replied, usually called back, usually stayed in contact.
We have to remember, they were planning to go to Big Bear for the daughter's 11th Birthday. They probably wanted to get the planning completed and needed Maya's input.
Maya may have worked from home and that locked door to her bedroom / possible office space doesn't bother me at all. She was a Defense Contractor.
It must have seemed weird husband didn't know a thing about whether she was behind that door or not. He must have said he heard her rustling around the kitchen Friday night like he said on the phone interview. I don't know if he tried to say the girls were home schooled by Maya on Friday because IMO that is a mistruth by him. The family knew already something was very wrong for Maya to not call them back, etc., They must have asked the two daughters. It's been reported that the 9 yr. old is said to have been the last to see Maya in the home on Thursday. Then, the argument with husband, then Maya seems to have disappeared because she was probably not there Friday nor reachable by phone.
What I'm most vague on is what the family did before reporting Maya missing. I think they called hospitals, and maybe other people, but can't remember where I read that. I do think if left to the husband, without it being the birthday weekend and the family showing up looking for her, Maya may not have been reported missing for awhile longer. Didn't husband give a story he got in trouble once looking for her? (JMO here, sets the stage that one, always has a reason for not doing something.)