The more I read about this, the stranger it becomes. My first thought was perhaps someone was with her and panicked when she showed signs of distress (either from the accident or possible substance use after?). And rather than go for help, made a bad decision, and hid her instead so they wouldn't be associated.
But she apparently knew the person at the house who later got arrested for prostitution. I dunno what to think at this point.
And it sounds like the hot tub lid had to have been latched/buttoned from the outside. Can anyone confirm this? I have never seen a hot tub lid that could accidentally latch itself from the outside with a person in it (I imagine that would be a huge design flaw).