The futility of her sister's ambitions. There'll be no happiness in it. And her brother won't find relief. Pursuit of her own dreams seems unlikely, due to the willfulness of her sister and resentment of her brother. She’s the smartest, and the saddest.
She watches things go away. Doesn’t even try to keep them. Maybe gestures, raises her hand toward it as it goes, though otherwise immobile. Things she doesn’t have to lose. The paper blown away by the wind that she could easily catch. What’s the point. Nothing's worth holding onto. Gone soon enough anyway.