No, it was not that. She just did not like having to listen to her Big Sister.
She did not like having her view proven wrong, which was the source of her present upset.
"Fifth Sister, you seem happy." Su Xue's tone belied a meaning she hoped her sister would pick up.
"I am." Ever since Fifth Sister chatted with Su Wen the night before, she had set herself a goal. She became more centered with an idea of what she wanted to do.
The only thing left was to put in the hard work. Once she reached her goal, she would become useful to her family and bring glory to her Big Sister, hence, her good mood.
"Are you going to college?"