This is just my speculation that in the OG story that MC read
beatrice is plotting to control the royal family and ordered the killing of the OG MC
Beatrice orders the creepy guy to order the other creepy guy to marry MC and kill her to get the MCs family money then said money is in turn goes to beatrice, giving beatrice lots of monetary power, then manipulating the duke into loving her plus controlling the red hair biatch's father with money, but red haired biatch got sick of the manipulating and turned on beatrice