Thanks for the chapter!
Yes, the MC is going to change from a doomed to death/exile destiny to a full harem + reverse harem course where she snags up all the main boys and girls. Here she takes down her first female victim. Would be funny if did but considering how strict and overwhelmed with rules the nobility are along with the training of their kids not being spoiled rotten she'll grab all the boys but the girls will firmly keep her in the just friends box. Considering the blatant discrimination against Katarina I have to wonder if the game designers really hated her or something. After all, she either gets killed or exiled or disowned in every ending while Mary either gives up her fiance or manages to marry him. Considering the MC's personality this probably won't be the first time she stole a role or lines from one of the other characters. Although she really should be more careful with that book of all the endings and stuff from the game. Unless the language isn't the same thing as Japanese it's going to raise a lot of questions she can't answer if someone finds and reads it.
Btw, proper term in English for being very talented growing and caring for plants is having a green thumb, not green fingers.