My main concern is why would RN tell the ME one thing, that Max was last seen in the kitchen, and then tell her sisters other details, like he was last known to be playing in the hallway? If you're explanation is correct, then she should have shared that with the authorities, and not just said " he was in the kitchen last I knew.'
And if she did hear him playing in the upstairs hallway then imo, she should have left the bathroom, and gone and checked on him, and asked him not to run in the upstairs stairway area. imoo
In many ways a 6 yr old needs more supervision than a toddler. And I never said she was a vicious criminal, just that she was not a very good babysitter,imo. She should not have been in the bathroom for up to 20 minutes while she could hear Max running around in the upstairs hallway, unsupervised. That is not 'trashing' her, just stating my opinion. And the reason it is important is because I see it as a valid motivation for either her murder or her suicide.