I've said before, reading much of what is written about Jean personality wise, she was willing to do what she was willing to do, and nothing more. Seems Jean was unlikely to change her mind once she made a choice regardless of others influence. She worked very hard...especially considering she was coming from a much less visible and demanding entertainment career. She successfully moved the group passed the DRATS era...Assuming that she was a salaried [[and sales royalty receiving) employee, it's understandable that after a years public acceptance she should have had a better deal and % of partnership rites....This, as we all know was not Mary's doing.
When the huge sales on singles started slipping, her bottom line must have taken a big hit...and it was the same workload travel wise, and time away from home....Jean supposedly by nature had a stronger "happy homebody" streak that is hard to satisfy being away most of the time. Maybe when she signed on, she was aware the schedule would be packed for a set period, and then once radio got used to the new sound [[they seemed to be thru River Deep) and the public got used to the new group, the touring would ease up a bit...The groups road money was still off setting recording budgets and feeding the company.
The problem escalated very quickly once Cindy was gone...with Lynda the group of 3 only had 1/3rd die hard dedication to the name, the legacy and the company. The group already experienced one uncooperative and unhappy member with Flo. If Jean and quickly Lynda were that unhappy, best scenario did happen bringing much loved Cindy back and getting Scherrie...MSC was a great group with high potential and appeal...it blew up beating a dead tired, too brassy, too fast paced Vegas act and replacing Cindy a 2nd time. Having her there was important...she added stability and familiarity.