Honestly she should let the other girl go; why waste your time with someone who isn't a human being, just an extension of her parents?
Let the other girl enjoy being **** by her arranged husband (which is pretty obviously what happened next).
i think that's a very sour way of viewing this manga. it's not like it's her fault her parents are like that, and it's very clear she wants to move beyond just what her parents wanted for her. i don't think she has the power you think she has here...