I find The Monster Duchess and Contract Princess better. First, in it, you get to really see all the misdeeds. Here it's in one chapter, she is already gone to the good family. You don't have the time to get pity for her.
Second, she got to the mansion to easily. If that the family wanted her so much to get her to leave, why haven't they done so long ago? There is only the father who wants to keep her but it's pretty weak. Also, how did she goes through the guards without being stopped, and she reached the mansion on foot, with vague indications.
Last, there is little reason for that much of mistreatment. Sure, they could have treated her coldly with no happiness; but with that much of hate from the beginning, they could have just refused her. Also, do you really think it's a good to mistreat the daughter of an archmage? If you wanted to vent your frustration on her, don't let her go so easily, you'll get the revenge from her true family soon enough. Also, the one who is the most likely to vent his frustration on her is the gentlest one (the father)