I despise Disney but if this story is as it says. I don’t see this as a liability on their part.
The lady should have sat down and waited on a handicapped boat or declined. I imagine if the attendants had told these people that the Mom could not ride unless there was an available boat, they would have been sued for not caring about the handicapped.
I have to say that I feel bad for her family because she looked like a nice woman. That said, this lawsuit looks like an attempt to get their hands on some money.
The conduct of the Disney Sidney’s alone merits a few million in general principles.