Some books that might help you are the Toxic books by Susan Forward.
She wrote one about having Toxic Parents and another about having Toxic In-laws.
I found the parents one the most useful even though it's actually my in-laws that are the issue.
And she doesn't expect you to forgive before you can move on. I think she liked that (forgiving at the beginning of the moving on process) to expecting to feel better before you take the medication when you're sick.
Sometimes you need things to be the other way around, to move on before you forgive, or even just to move on for your own sake without ever forgiving.
Another book that might help you is Byron Katie's Loving What Is. She also wrote Who Would You Be Without Your Story.
I find her a bit too 'woo' for me on the whole, but I like some of her ideas, and have put the bits that I feel I can work with into practice.
One of the things she works with is letting go of intrusive thoughts and not living in other people's business. She she might say that the things your mother said are your mother's business, and what's hurting you is that you're letting them stay in your head.
Maybe take a look at her website before buying the book. I think Loving What Is is the more useful of them but they're both interesting.
I'm sorry that counselling didn't help you before. I'm not sure what kind of counselling you had but it might be worth trying again, with a different counsellor or a different type of counselling.
Perhaps also, if you can think of what you want to get out of counselling.
You say you want to let go of the hurt and move on, so if you tell your counsellor that they will try to work with you to do that. They might explore how you could do that, what it means to you to do that.
Are you wanting help to stay with the hear and now, rather than dwelling what she said before and what you'd like to say or have happen next?
But it will be about you rather than your mother, so if you're looking for a way to manage her or change her it might not work for you.
I hope you find a way to work through this though OP. If this is how she is, at the very least I hope you can believe that this isn't your fault and you don't deserve it. 