Hmm she is on a path to become someone she is not, her sister.
Getting frustrated when her father "reads her" and gently reminds her she doesn't need to push herself.
She wants to be her sister? She wants to continue her legacy? She has survivor's guilt?
Either way, her path towards perfection is self-destructive and I think she knows that, so wants company, but she doesn't want someone to stop her.
Maybe?