SPOILERS ALERT, question(s) about the end.

SPOILER:

How did Ian Holm's lawyer character figure out that Sarah Polley's character "lied" as a result of her holding a personal grudge of some sort against her father? Notice how he says "any kid who can do it to her FATHER is not normal" etc?

Why couldn't he maybe assume that she didn't tell the truth because she was nervous? Or scared? Or felt personally that nobody deserved to win the settlement somehow? Or maybe this was her way of paying respect to the dead victims of that bus crash? Or...?

Granted, we saw the movie and ultimately know what happened. Spoiler, the father basically, err, for lack of any "better terms", sadly, incest-ually abuse her (would we all agree it was abuse even if say unlike the Ray Winstone character in "The War Zone" (1999) he may not have used violence to force her?) and it possible that THIS was her way of getting back at him for that?

But the lawyer character probably had NO IDEA about any of that.

But still, he assumed she did it as a way of getting back at him, wonder why?

Thanks.