I wonder if there’s any physical evidence to corroborate the child’s story. If not, I think I would find it difficult to convict the father. Small children have a tenuous grasp on reality and are very easy to manipulate. A relative with an axe to grind against the accused or even a well-meaning social worker could get a small child to say most anything. I also find it hard to believe that the child has a clear memory of something that supposedly happened when she was two years old.
I have memories of lying in a crib at night with a lightning pattern of light on the wall. If the event were sufficiently traumatic to the child, might two years old be old enough to retain it? Maybe a child psychologist would know.
Years later, it was proved that those children had been prompted and coaches and, most likely, the incidents that sent people to prison never happened.
Child advocates, mental health personnel, etc., know how susceptible children can be to suggestions, prompts, etc. Some not-so-ethical personnel do use tactics to sway legal or public opinion.
Old adage regarding marital problems: Children make good weapons.