My mother is 88 with dementia. She plays Bridge and Bingo at the senior center. One of the ladies today approached my sister and said she really doesn't play anymore. She doesn't know what to bid etc. Just too confused. I dread telling her. I know she can still play Bingo. She won 3 games the other day, but Bridge is Tuesdays and Fridays and she'll hate staying home those days.
Have you considered and adult day health program? On the days that my husband didn't like the organized activity (such as Bible study) he could read or nap or do jigsaw puzzles, etc.
Otherwise, maybe gradually suggest she is needed elsewhere at those times for whatever reason. Or, send her to my house. I have no idea how to play bridge. Lol xoxo
Sounds like the only thing you can do is try to distract her on bridge days, get her to go somewhere else until the game is over?
Reasoning with a dementia patient is so hard because they truly don't understand or recognize their cognitive regression.