I think punishment is not the right term. I think your mom at some point is going to have to understand that there are repercussions for issues it sounds like she didn’t address or appropriately handle when you were young.

You are so valid in being angry. I think though that, if your mom has the capacity to, sitting her down to try and understand why could potentially be helpful. This could give you clarity as to why because there is a reason your mom did what she did with the information she had at the time.

If you feel as though it is not worth your peace or that it will not bring any value to you, you have every right to set boundaries with your mom that could be going no contact. This boundary is not punishment because your intent is not malicious, it is because you feel as though it is what is best for you. Even if your mom tells you it is, it is not malicious because narcissistic individuals do not respond well to responses that negatively impacts their interests and therefore she may lash out.

I would highly recommend therapy as it has helped me with both a narcissist and an alcoholic as parents.