She just didn't want to live with her mother-in-law. If she really had to live with her, then the housework would still all fall to her. When she dated Zhang Yong'an, she used to vie to do the household chores, but since she was young, her own mom never made her do those things. Yet Zhang's mother treated her like a maid, ordering her around, and she didn't dare to talk back for fear of leaving a bad impression on Zhang Yong'an.
Anyway, she was determined not to live with Zhang's mother. If they did live together, she'd never have a day when she could rise above her current situation.