I questioned the same thing. IMO not showing up for a full day of work would warrant a call to check up on the employee. Not being able to reach them would raise more concerns especially if CM was as responsible as the boss had said (I believe she said she never missed work.)
But then again that is just my own speculation. As a matter of fact, I would also think that all of the close friends and the bf would have been even more concerned than the boss. Most especially the bf! He said his phone had lost power and he was asleep, but when he awoke on Saturday, I would think that seeing all her texts, the last two being that she lost her keys and needed him to leave to door unlocked, would have at least made him concerned, especially if he loves her as much as he professed in the weeks after she went missing.
JMO, of course.