Photos or it did't happen
If she was so manically documenting, and in an era where hardly anyone is without a mobile, why not the odd sneaky photo as part of her evidence?
A bit dereliction of duty for kids to constantly go in an out of bounds (locked) bedroom and for so long.
I cook a lot, but very little that requires a solid half hour stint in the kitchen, most meals normally have plenty of chances to take a break during prep / cooking - and if you are looking after the kids you should be making sure you are keeping an eye on them.