Steve universe nonsense moment.

Can you interpret what this character(amethyst) is saying in universe or out of universe?
https://www.youtube.com/watch?v=XsOgW12daSk
I have no fucken idea what this concentrated insanity is to this day despite watching the entire show.

>Get Steven to a place
>Want to show something cool
>Start rambling that she is a monster
>Starts to cry
WTF!

This is really crazy and makes no sense for me.