Her brother did speak sense into her but for some reason I don't completely agree to his reasoning. He just bared his motive out in the open. He sees talent in the MC and uses his sister to make his accessories popular to make his town flourish. Her brother saying to give up on that love is very reckless. Who knows when she might implode again given, she is very volatile emotionally. He could have at least said to separate personal matters over professional matters if he's actually a civil servant. At least that's what a mature adult would advise someone on, I think. Then again, it just feels painful to see she's just being used as a pawn for whatever plans his brother has.