With regards to female pedophiles it is becoming more common, perhaps not as common as male pedophiles but there are women out there who commit horrific crimes against children. A recent example would be the Nursery/Kindergarden teacher in the UK. She horrificly sexually abused numerous children, recorded it on her phone and sent the images to God only knows where, and, another woman was also involved in that case. These were mothers, apparently law abiding citizens. You cannot trust anyone or rule anyone out IMO.
And as some have already said, Sandra Cantu's killer