You have the same reaction I do. MS was kind of young to be formally diagnosed with Bipolar. Teens are all over the place in moods, so you'd need some solid evidence leaning towards bipolar. I didn't hear any symptoms related to that. After all, they kept insisting MS was a "happy-happy" girl.
JS didn't even mention MS had bipolar in the interviews, only ADHD and some Autistic tendencies. Yet, Maddie might've thought she was. Hmm, JS may have kept implying that to Maddie that she was also bipolar, and throwing her own diagnoses at Maddie. Self fulfilling prophecies can be very damaging.
All that need for meds before bed, and can't sleep alone, the mom wants to make it sound like she's making educated decisions under doctor's guidance, when really she's sending her very young daughter to bed with a pedophile, and acting dumb about that selfish choice.
MOO, and not sure I can express it so it's understood the way I see it-- I think both JS and SS were manipulating Madeline with all this limiting reasoning that didn't build upon her stability and strengths, but kept her in a weaker position so they could move her around like a chess piece for their own benefits. All MOO here.