This is such a headscratcher, especially because we know there was video footage (either from cellphone from family/victim or CCTV at the dollar tree, i dont believe it was released), theyve somehow ruled out mental illness (im guessing completely normal MH history and acting normally prior to this?), and the emergency release of the freezer was working...and i HAVE to assume if someone was following her or harming her on dollar tree CCTV we would have an arrest or images released of the suspect!
what options are left? all i can think of is drug use (but nothing to indicate that) or sudden medical event (made her feel like she needed to cool down, maybe she was going to find the bathroom to splash some water but passed the cooler and thought it would be better, then fell or fainted once in the cooler).