And actually this is moot.
She never said anything about this to them, or even to her husband, according to testimony of one of his girlfriends.
So why does it even matter what the parents would do if they had even known her wishes? This is irrelevant to the issue at hand.
On the other hand, from a judges' viewpoint, the Schindlers came across as not believable witnesses; they seemed to be afflicted with fanatical beliefs. Fanatical people are known to massage the facts to further their cause.