so sorry you did not get the response you hoped for from your mum, i have not read your pother posts so this may be way off mark, but in my experience, parents can be blind to a lot of things that happen to their children, and often are unwilling to acknowledge this or things that happened which they are fully aware of, because acknowledgeing things were not right is admitting they were not good parents, or that they failed at protecting you in their eyes and no-one wants to admit failure especially to their children.
this however does not excuse her behaviour now, throwing it back at you was wrong, the least she should have done is listen to you.