Were there any other people in the building when the mother took her daughter in there or was it easily accessible? Was there evidence of how the child died or when?
Those would be important questions that I would have.
So what you’re saying is that if a body can be hidden well enough that by the time it’s found, cause and time of death cannot be determined, then you’d be unwilling to convict anyone of killing the deceased despite a plethora of other evidence (including behavior) that the accused committed the crime? Seriously?