Our high school cheerleaders did a lot more than hold a sign and wave pom poms. They did pyramids, jumped in the air and did splits. Sometimes the gals would carry other cheerleaders on their shoulders during a cheer. I suppose someone could try and wear her as a hat, but I dunno....
Perhaps so. But these activities are not required to excite the crowd and, as I noted before, perhaps not advisable due to the high risk of serious injury or death. Moreover, as I also pointed out, her inclusion on the squad doesn't prevent other girls from doing these things if they so desire.
Do you contend that the crowd would be affirmatively de-excited, if you will, by her presence? "Gee, I'd really love to cheer for the team, but I can't believe the girl in the wheelchair is holding up a sign that says 'GO TEAM.' I just don't know how I could cheer after seeing such a sight."