Perhaps you should write out your chain of events. Preface sharing it with her with saying you need for her to read and see the chain of events as you saw them. However, do not expect her to agree that you are responsible for the events. You were acting still at the hands of an adult perpetrator and were in survival mode; you did what you did as a child, not because you were a bad person, but because you were acting to survive somehow what was happening to you. All ultimate responsibility lies with the adult involved. Your T won't ever blame you for your actions however they transpired in the presence of the adult perpetrator.