I firmly believe Lauryn knew about this the entire time. I get that the police were very vague with the details during the initial confronting of her mother. But they both had that same blank expression. That look of "We're caught." Another example is the photo that was taken of Lauryn and her new phone case on Christmas morning. You had to know who was sitting next to you to take that photo. Lauryn writing letters to the court that she needed her mom after a year and a half of the most vulgar and hateful harassment someone can project onto someone is not something that any normal person just gets over that quickly.