God it’s awful when you spell it out like that. She seems to have spent her whole life causing pain and emotional damage to those around her, and even people associated with those around her. And she’s done it deliberately, with malice aforethought. Why?? Is it just for kicks? Is she really that sick?
One example: I still cannot comprehend her behaviour around her teenage step-sister’s funeral. She quite likely never even met the girl, due to her estrangement from her father and step-mother, the 30+ year age difference, and the fact they lived on different continents. So why on earth would she fly across the ocean to attend the funeral, when specifically asked not to, unless the purpose was to inflict further pain and distress on the grieving mother. It takes an exceptionally sick and twisted person to do that. To anyone with even a scrap of human decency, it’s incomprehensible.
And as for Bianca: I’m afraid if I were in her shoes, I’d have scarpered ages ago. I simply couldn’t put up with that toxic witch in my life. Most people couldn’t. Bianca is obviously made of very strong stuff, and Ioan is lucky to have her.