This could be very simple - what if Ron and Misty got into an argument about Haleigh misbehaving and Ron told Misty to give Haleigh something to get her to go to sleep. Misty does as told and it was the wrong thing and Haleigh simply died. Misty called Tommy, Timmy, whoever for help. Rather than admit an accidental OD, they concocted this story ? Ron wants them to be quiet because he is the one who told Misty what to do...could it be this simple ? 20 to 90 phone calls trying to reach Misty with no response - no 911 call until Ron walks in the door...WOW.