They made her cook the first time she visited their home.
They're clearly trying to assert their dominance over Zhang Yue'e.
If Yue'e were to truly marry into their family one day, she would never be able to hold her head up in front of them.
Zhang Yue'e's social circle is small and she doesn't have parents, so she has no experience with this sort of thing. Feeling instinctively uncomfortable, she wrestled with it all day, thought it through, and decided that out of all the people she knew, only Suizi was smart enough to give her advice.
"How did Xiaoli react?" Suizi looked at Zhang Yue'e, who was clearly upset.
Suizi couldn't imagine if her own daughter would have to deal with such a stubborn and unreasonable mother-in-law when she grows up, how she would handle it.