Oh that make sense. She definitely a good mother but as a person she horrible.
Yeah, she really is... I mean, any mother would do anything for her child, even if it means killing someone. In the queen's case, she already failed her plan because there's no secret that can be hidden forever... Eventually, Jeoffrey's secret birth and identity will reach the king, pretty sure he already knew about it. But yeah, she reminds me of Silike Blanche's mother who's also a queen from "Reborn as the Enemy Prince" they are so alike in a sense, cause she would also do anything for her son to be seated on the throne.
It's no wonder why the queen kind of obsessed into writing it out for Jeoffrey that he's the sole heir to the throne and even making him stay at the palace and ordered to stay away from Edward, BECAUSE Jeoffrey is a prince in another kingdom and if someone finds out that Jeoffrey is not the king's son, it would surely strip him off as the candidate (I guess)... and that would lead to open an opportunity for Edward to take it instead because he is the legitimate heir. But Edward still became King either way so...
... if I remember correctly, a commentor spoiled it here and had read the novel.