I would quote the "die in peace part" said by PAK so people would know what I'm referring to but it is quite a lot of stuff to read through.

Anyways...just because it says a soceress can't die in peace, doesn't mean she cannot die. Dying in peace may refer to a number of things. It may mean that even though she is dead, she can't truly rest or move onto any possible afterlife. Like the Unknown King, whose passage wasn't allowed because of some reason (if anyone can actaully correct me on that part, I'm a little sketchy on it but I can remeber seeing a ghost of some type). Just because she isn't allowed to die peacefully, doesn't mean she can't die but have to stay in this world.