MMDad
Lem Putt
Okay, so it's not a "fact" that she was an aide? Not a "fact" that she was there to be...um...aiding him? Not a "fact" that she left him alone to go do whatever she was doing besides aiding him?
I could see leaving him in the middle of the movie to run out real quick. You know, when he's settled and engrossed. But apparently she left him at the end of the movie, at a time he obviously needed some help to understand what was needed.
Negligent? Yes. She was being paid to help him, and when that help was needed she was not there. If the parents go after anyone, the company she worked for would be a good start.