I've known Jean well for decades and also knew both her parents.
Yes, there's a little room for interpretation, but those of us who know her and were around back then understand that Jean was ready to call it a career in pool. I'm not going to read the attached thread, but the truth is that the Robin Bell incident for which she was fined was merely the straw that broke the camel's back. Jean was going to leave the game soon with or without that incident.
Since you seem to care about the history, don't overlook that Jean was already doing pool exhibitions as early as the age of six and was competing by the age of twelve, so her retirement at twenty-nine was not as "early" as it might appear. She had no worlds left to conquer in pool and she was a world class athlete, among other things a world class basketball player. I've played golf with Jean and she could hit it over 300 yards off the tee. At the bowling alley, her average was over 190. Jean wanted to play all the sports, and she got to live that dream.
The great mystery is that, just like Jean, Mike Sigel gave up full participation on the pro billiards tour after the 1992 season at the age of thirty-nine, considered by many the best ever pro player. Like Jean, he was best in the world at the moment he gave up full time competition. Known for his 100-hour weeks of practice he, similarly, had few worlds left to conquer in pool and he quickly walked away and became a successful cue-maker.
Sometimes, even the greatest at pool burn out early. Many have suggested that it is already beginning to happen to the 40-year-old all-time-great Shane Van Boening. Exactly how the minds of the greatest champions work will always baffle us to a point, but good for you that you care about pool history and like to explore these matters.