The Queen Mother is now 25 years old and has sole power, while her son is only 2 years old.
She carries the eternal infamy, but she also wants her children to live. She doesn't mind being like Lu Pheasant.
The man who kept saying he loved her back then sent her into the cold palace for the sake of a woman.
So, she first killed the king and then usurped the throne for the sake of her children.
She did not become a queen, but became a queen mother in a grand manner, listening to politics from behind the curtain and paving the way for her children.