@Isolorza90 Well, that makes sense. She's avoiding them because she literally took the place of their daughter and friend. The real Yunifer may as well be dead.
Plus, it feels really weird to treat someone else as your father when you're already an adult inside. Maybe the guilt, together with the fear of being found out and killed (since this is a world of magic so the chances of them believing she's been possessed is much higher), and awkwardness of interacting with people she doesn't know who she must act as if she does...all that is quite tough. She's not perfect, she's in a weird situation, she doesn't know what to do. If her actions seem like something she shouldn't have done, that's just because she doesn't know what she should've done.
Well, this is at least better than them knowing that their daughter and friend is actually gone and someone else has taken her place. Best thing for them would be for her to act like the actual Yunifer, but it's not the best thing for MC herself. Maybe she doesn't want to live a life of constant lying in front of them, maybe she wants to separate from them and create her own life....most people would want that rather than trying to be that person. Most people would try to separate from previous relations if they found themselves in another's body.