The image from the Snapchat seems to be from "in a house." Doesn't seem that boyfriend recognized the space as the house they shared. It doesn't seem to be from her mom's house. So, was she in someone else's house that evening? There is no way anyone in her circle or town doesn't know she is missing....so you'd think that someone would say, "She was at my place." Or, "We were at a coffee shop together." Or something! It's strange, imo, that nobody recognizes the space or is saying anything.
Of course, the Snapchat image could be a red herring.
The other thing on my mind, like everyone else, is the morning ride to work. What if she arranged a morning ride, and the driver showed up early - she wasn't quite ready yet so the driver came into the house to wait. And things went bad. Just thinking aloud.
JMOpinion