I agree with all of those points, but I have two points as to why I said “insane”

1) part of it was intended as a joke in reference to Karkat’s other selves being crazy, but not as crazy as Jadesprite

2) The main reason is that I am still under the assumption that Jadesprite joined an afterlife cult. Hear me out

Jadesprite no longer cared for the stories and future visions that she has seen in the clouds. That could be argued for how long she had died and accepted her death, but then she was saying that those visions were always “lies” and that her friends told her the truth and all that.

I agree that she had a hard and terrible trauma, but I also thing that these “friends” of hers she found told/convinced her that what she knew was fake and essentially manipulated her into this type of suffering.