I think how long she was under water is one of the most important questions.Not only how she ended up in the tub but also how long she was there. Was BK in the habit of bathing (instead of showering) in the morning, or had she gotten into the tub the night before? I'm sure LE has these details, and we will eventually learn what circumstances placed her in the bathtub and how long she was there prior to being found.