I am merely a reader.
I will not dissect your work.
I will tell if emotions surfaced.
I am not educated enough to do what the other reviewers do.
Hopefully you will find my review helpful in that a person read your work and expressed an opinion.
She is jealous of her sister. Watching her sister get all the attentions from guys is making her envy grow.
Siblings sometimes find they don't get along. There are fights for various reasons.
Our character imagines herself taking her frustrations out on her sister in many ways. Destroying the sisters clothes, pulling her hair, punching her face.
That will get attention from the parents in a very negative way. Grounding for our character, and healing time for the sister.
Imagined retaliation against the sister is all so much wasted emotion.
Perhaps our character should just be herself, accept herself, and work with the things God gave her. She is bound to be pretty in her own way.
Thank you for sharing.