If the story about the previous drugging turns out to be true, I'm stunned anew at the implications. It really raises the pedophilia flag higher, and how would the parents ever allow her out of that house again, really?
My theory:
I wonder if it will come out that MH swore up and down at the time that Sandra got into some Nyquil or her medicine cabinet and "OMG, I'm so sorry; I installed a lock just this second!" or that Sandra started feeling poorly at her house and she gave her some Robitussin or something. I, as a parent, would be very upset if a non-parent/grandparent gave my child medicine of any kind, but maybe Sandra's family felt like it was dealt with and charges wouldn't be pressed.
Turns out the drugging would prove to be very intentional, and it was done again, this time with fatal consequences. I think Sandra was unconscious, but alive, when she was placed in the suitcase, but soon suffocated because of the waterproof lining. She first took her to the church and was going to bury the suitcase in the crawl space, but determined she didn't have enough room to make that effort. So, the rentention pond was an afterthoughht. Disorganized crime and all.
I'm thinking molestation was the motive, but maybe it never happened. Things went awry.
So sad.