There are some interesting points raised here regarding her age.
On one hand you could argue that she was only 15 and thus didn't know what she was doing, yet the age of full criminal responsibility is 14, the age of consent or to join the army or get married is 16 and the age to vote is currently 18.
This is an absolute mess, and some people who would consider people not mature enough to vote at 16 are calling for her to be lynched for decisions made at 15, and some who feel a 15 year old is a child and couldn't for example consent to sex, think she is none the less fully criminally responsible being over 14.
I think it would make sense to set everything at either 14 or 16 to avoid nasty black holes in culpability etc that our current system leaves.
I personally think most teenagers are too babied, and know full well what they are about well below 16, so I would be very happy to leave her there.