That would completely destroy the point of the character. The fact that Therese believes that her father loved her and feels betrayed by Jeanette sleeping with him (despite Jeanette being HERSELF) is the blindside reveal of just exactly why Therese is a perfect Malkavian. She's not babbling about prophecies or breaking the fourth wall, she has a very relatable and tragic mental illness that causes her to view something horrifying as ultimately a good thing. Jeanette being a coping mechanism gone rogue explains why she's so upfront about their father being a piece of shit who raped them. It's a part of Therese that's trying to give her a (very nasty) wake up call about what her father was really like, or even what she was really like. Yes, it's absurd, but that's the point of being a Malkavian. If you changed it to be more "respectful", it wouldn't feel like VtM. Nothing about this setting is respectful or grounded. If the Therese subplot was completely grounded, it wouldn't exist, because it's completely inaccurate to DID.