It does seem odd that she would suddenly "change" and that your son collaborates the change in her. I would leave her be for a bit and take as much comfort as I could in your son's collaboration. It's very hard, what happened to her between the ages of 3 and 6; my mother did die when I was 3 and my father remarried when I was 5. At first it was great between my stepmother and myself, I needed a mother that badly and just morphed her into being my mother! It took a long time in therapy to straighten everything out for myself.

I wouldn't take her perception personally, it is not your perception or reality and we can't do anything about another's perception. What she believes does not make things either true or false anymore than what you believe and remember does; they are just beliefs, thoughts, and memories about the past and very individual for each person.

You have to support yourself! That's all you have at the moment. She may come around later, it can take many years to sort out one's life.