I have no words OP, the cruelty you endured was not your fault. They were evil, horrible people and you could not have done anything to change who or what they were.
All I can say is that even though I’m a stranger I’m proud of you. The strength it takes to stand up and face the world after enduring such abuse is nothing more than a feat of strength and the fact you went on to become a good person after all they put you through is a testament to how good of a person you are.
You hold that little girl’s hand every day, you make her feel safe and loved and she is in awe of you every second.
You cannot reverse the damage she endured or take those memories away but every day you as the adult go a little way to healing her. Every moment you play with your children, every board game, every laugh and giggle was you enabling that sad little girl another chance at her childhood. Every time you treated yourself to new clothes, a new haircut, new bedding, a day out, a trip to the cinema, tea out - you were treating her, buying her something pretty and she loves you for it.
Time heals a myriad of wounds but many will never close, I cannot recommend counselling enough but most importantly please remember to love and forgive yourself you are worthy of kindness and good things, regardless what they told you. They are the baddies not you.