with your mom's disablility, you probably should have done some research inot which rides/attractions wouldn't be a good idea.
you are talking about the Jungle Cruise at magic kingdom, and the tour guide (CM) has a "schtick" that is the biggest part of the attraction. he pokes fun at people, and jokes throughout the ride and makes corny jokes.
another one to avoid would be Monster's inc. where the camera zooms in on various guests in the audience an the the cartoon characters talk to them, draw attention to them,etc.
I'm so sorry about your mom's disablility. mental illness is very real, and not always understood.
I'm hoping your upcoming trip is better. may I suggest doing a lot more research. the disboards are great, you might want to pick up a copy of The Unofficial Guide to Disneyworld.