I think LZ was actually under quite a bit of stress. Not trying to make excuses for the drama that is. She has already figured out that her mom was not able to help her out. This is evident from the incident about the stroller. So I think she was unhappy subconsciously. In addition, she really wanted to relax right before the C-section. I think I can sympathize with that. However, the whole day babysitting stressed her mother out as well. And neither controlled her temper well. Thus the massive fight.