My grandmother is part of a sports fan club. This club is officially recognized by their team and receives exclusive benefits for their members such as early access to tickets that have early access to tickets that have a waiting list of months to years. The founder in question is one of my grandmother's oldest friends. A group of their friends put the club together a little more than fifty years ago so she's had plenty of time to get attached.
This woman is an unpleasant person, stubborn, loud, and generally abrasive. Right now, she is a co-chairperson of this club. She does very little now for the club other than cause tension. One example is that she demands someone print everything digital for her, admittedly, this is something fairly common among those uncomfortable with technology. In her case however, it is truly a demand and slows down club administration. Most of the people in the club value it too much to leave just because of her, but it has been voiced by a number of people that it would be much more enjoyable without her causing rifts. Additionally, she does very little to actually help the club in any way.
My grandmother, being a far more likable person, has to hear from the club members about how unpleasant this woman makes it (as well as experience the unpleasantness herself) and hear from the founder about how everyone is conspiring against her.
So my question is, for the sake of my grandmother's sanity: How can you convince a founding member to step down from their position of authority?
This question is about taking someone's place, which my grandmother has no interest in doing.
Edit: I believe it is registered as a non-profit. I don't know the exact structure since I'm asking on behalf of my grandmother.