Narcissists employ a whole range of deceptive tactics. Feigning innocence, is one of many.
They will intentionally do wrong in a covert and manipulative manner, and then ask ‘have I done something wrong?’. They know exactly what they have done wrong… but will act like they have done nothing. And then if you confront them, they will lie, deny and tell you – you are the problem. It becomes gas lighting.
When I know I am dealing with narcissistic people (which I am and I have blocked her from my social media), I can read them like a book. Having lived with narcissistic people throughout my childhood and having to learn all their tactics to survive, I am vigilant and adept at seeing them in action.
Strong boundaries are always needed, because highly narcissistic people, do not change. They are dishonest and selfish to their core. I do not play along with their games.
Dr. George Simon has excellent info and books, regarding these highly disordered people.