"The daughter is presented as people see a typical teenage girl being, the boy is the one the viewer is supposed to warm to and praise. He's the one who shows love, care, concern, is thoughtful. The girl only shows any love for her brother upon being given a gift (as teenage girls are all materialistic)."
No, the poor girl was being tormented by him, you're supposed to feel sorry for her and it was the fact that he's realised he upset her and tries to make it better that makes her happy...unless anyone actually thinks teenage girls are desperate for M&S shoes 
She wore them to play in the snow, she didn't actually like them or there's no way she'd have ruined them straight away.