She really shouldn't have!
She shouldn't have wronged Ni Cuihua without knowing the whole story.
Now it seems that Ni Cuihua is not only not a bad stepmother, but is actually a very understanding and good mother! Her own daughter was in a life-or-death crisis, yet she still thought of her stepdaughter's wedding.
If it were anyone else, they wouldn't be able to remain so calm, nor would they sacrifice their own daughter to fulfill their stepdaughter's happiness.
Upon this thought, the elder Mrs. Wu immediately apologized to Shangguan Xi, "Xiaoxi, I'm sorry, grandma wrongly accused your mom without knowing the situation earlier, I really shouldn't have."
The elder Mrs. Wu is a reasonable old lady, and if it was her mistake, then she would not shirk responsibility.
That uncle who stood up for the Wu Family just now quietly slipped away because he couldn't save face.