@Purplelibraryguy
Because, ultimately, her concern and love is for Wahei, who it seems she practically raised.
She's not a bad person, but I think she was convinced that he's been forced into an agreement and has become a doormat. She's basically acting forceful to give him a way out in a tough situation, acting like the "bad guy" so that he wouldn't feel guilty (the equivalent of using your parents being mad as an excuse to not be peer-pressured into doing something you're not comfortable with).
It would've been nice for her to meet the girls, but I think it was better that she didn't until she saw Wahei's resolve. Now she can approach the girls with a more open mind, instead of feeling resentful that her precious nephew might be taken advantage of.