ngl, I think Marika's mum is more of a misunderstood character than an antagonist
Like, she even thought about having a family and what it would feel like if it actually went smoothly
Her so called "Violence" was basically her trying to relief her own pain
As you can see, her own daughter's body didn't have any proof of receiving any physical violence from anyone
And also, she seemed more like a really strict woman than an actual child abuser
Disclaimer: This is my own thought about Marika's family conflict (Takae = Her identity as a middle-aged woman, Marika = Her identity as the elementary school child)