https://ew.com/tv/2019/02/25/beverle...-actress-dies/
As far as I know, she and Pat Priest (the 2nd Marilyn Munster) never met. Beverly left the show, returned to NY to marry her boyfriend. As she stated in an interview, the marriage ended in divorce but she got two wonderful daughters out of the marriage. She also said she was naïve and signed "one of those seven-year Hollywood Contracts" without really reading it etc. The realization that she and her boyfriend would be on separate sides of the country caused her to cry on the set, which apparently bugged the shit out of Yvonne DeCarlo. Al Lewis and Fred Gwynne were more sympathetic and demanded that either Beverley be allowed out of her contract or they (Fred and Al) would refuse to show up for work. Apparently the executives thought Beverley's crying was a ploy to get more money and they refused to let her quit.
Here's a documentary on the show:
https://www.youtube.com/watch?v=gX_s449BVeE