Spoiler....
According to the novel, i believe that is the real mom. I believe she was a spy that fell in love. And then ended up splitting up the family. I believe she later gives her life to save the little girl.
She did? I just saw the spoilers from other reader's saying that the last kid (FL) was not planned and because of that, she gives FL to the enemy duke to make use of her or something similar
Spoiler...
Yes, that is correct. Also mom gives life for Dad, not daughter.
Well, tbh the first look reveal of the mom looks like a fake heroine/villainess already lolol so her being bitch is kinda a big give away