She is now a servant with every of her reflexes conditioned by her own mother since long ago.
There's a power vacuum.
The daughter fills that vacuum by being abusive toward her, driven by anxieties caused by that missing "mother figure" since she was very young.
She, unconsciously, wants to be the daughter she never was with her own mother. This put tremendous psychological burden on the daughter.
Children need boundaries, set by their parents. Imagine how terrifying it is to walk on a high bridge that has no guardrail.
