Uh, yes it is. Throwing old hag into oven, wolf eating grandmas and little pigs, stepmothers trying to murder their stepdaughters and a lot more. Children's stories are full of fucked up stuff.

Even recent ones (movie in this case); In Frozen 2 the king murdered the leader of Northuldra which is shown in the movie.

To be fair, I call anyone 15 and under a child. I think they probably just meant Young Adult books. I was like 10 or 11 when reading Artemis Fowl which most definitely involves a shocking amount of murder, kidnapping and torture. Also can't say that it's not geared towards people that age when Artemis himself is 12.

Harry Potter literally starts with double homicide.

Have you heard of the Hardy Boys or Nancy Drew?

Ever read Roald Dahl?

I read a YA book when I was a kid, pretty much the same plot.

A girl was murdered, wakes up as a ghost, and has to solve her own murder to find peace.

It also touched on suicide and self harm.

Books targeted at kids need to be age appropriate, but at the same time, if you pick some topics that are unallowable for children all together, you're going to wind up with a young adult who is naive and completely unprepared for the world.

Nah, the book doesn't have to be explicit on how the victim died. Death is part of life, and have been present in children's book all the time. It will be fine.

Redwall is a classic series for the 8-14 ranges, and it's got some pretty brutal scenes

What about nursery rhymes, there's plenty of violence in them: https://www.quora.com/Why-are-nursery-rhymes-so-violent

Yes kids should be brought up in a safe environment, but you will have to prepare them for the real world at some point.

Lol have you actually read books?