I think the answer is Rhyme and rhythm
sonnet 18 no 4
"So long as men can breathe or eyes can see,
So long lives this, and this gives life to thee."
C sorry if wrong good luck
I think the author established anger as the mood in the excerpt. It is noticeable how the character is furious (for whatever reason) and shows her emotions by tearing that thin handkerchief into ribbons.
Hope this helps :)
