Thanks CodeMage.
>Also, bear in mind that he wasn't charting the emotions of the protagonist, but the protagonist's fortune.
Taken from the article:
"Is she even sadder now? No, she’s already a broken-hearted little girl."
"and she becomes off-scale happy" [draws line upward and then infinity symbol]
So I don't think Vonnegut differentiated much between fortunes and emotions of the protagonist. He exchanged the terms for one another freely.