I relate to your story, especially to the part of systematic dismissal and invalidation.
Trying to confront a parent about their past abuse is unlikely to work - there are too many psychological defences and it will likely end up with devaluation and denial going on and on.
You mentioned talking to a specialist about your past. Can you contact her more? First thing you need is seeing the reality for what it is not what your mother tries to make it. A mental health specialist with experience with child abuse survivors can be of great help there.
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Let's not confuse being normal with being mentally healthy.
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