For early childhood trauma there is no quick fix. Imagine if there was. How would it work. A magic wand? A pill? Think about the developing mind of a child how it gets twisted day by day.
3yrs is very early. I've been with T 12yrs. Yes I've had times when lost hope because it can feel like nothing changes. But then I'm faced with a situation that in the past would have crushed me then out of the blue I face the situation with more inner strength.
I trunk that's what therapy does. Builds us up from the inside. Whether life is 'better' is subjective. Life is still life. But not so crushing.