On the one hand, crazy shit happens all the time, and folks win by sucking out or by insane bluffs.
On the other hand, it's not considered honorable to win by mistake. Winning by catching a 3% is luck - but just screwing up isn't cool.
So, even though $130k (or whatever it was) seems like a lot of money - there is honor among (some/most) poker players, so it seems totally honorable to me that she gave him the money, as she doesn't feel she deserves it.
I don't know how she would have cheated. Maybe she did but it doesn't seem to me like she did.