Zhenzhen replied, "But Auntie, I need to work during the summer to earn tuition for next semester. Normally, my part-time job only covers living expenses. If I don't work over the summer, how will I afford my tuition? Unless, Auntie, you let me take care of you and then you pay my tuition."
What Zhenzhen said did make sense. She was working to pay her own tuition without asking anyone else for help. Suddenly, she's asked to care for her and stops her from earning tuition money. It wouldn't be too much to ask for her to be compensated for the time she would have spent working.
However, when Xiumei heard this, she became agitated, "Hey, what are you saying, girl? Have you become obsessed with money? Taking care of your little aunt and still talking about money."
"If I don't ask for money, what will I do about next semester's tuition? If I come to take care of you, I won't have time to work, so what about my education?"