From the wiki "After her capture, Boronda admitted her crime and expressed no regret."

Yep... that part was clear from the picture.

...in this case, they disagreed on whether he should or should not keep his penis:

https://en.wikipedia.org/wiki/Bertha_Boronda

Nope, mayhem means deliberately maiming a person with intent to disable or disfigure.

I would argue that people aged less rapidly back then. Her hair is old lady hair, but her face is young lady face (if that young lady was not wearing any make up). But since very old ladies of this time period looked just about the same as this, she looks like an old lady of this time.