It was all bluster. She just didn't have anywhere to stay and didn't want to admit that so she came in demanding the family home from her sister while making an outrageous demand using money she didn't have. She didn't expect it to really work, she just also didn't expect to fall quite so hard on her face.I disagree author, the lil sis ain't cute at all, she intended to destroy their lives.
She just happened to fail is all.