The Waltons S09E10 - The Tempest

As Mary Ellen travels to Florida to find out more about Curtis and why he chose not to return to the Mountain following what happened in Pearl Harbor, Jonesy decided to stay until she returns home and temporarily gets a job working at Pickett. When Erin finds out that J.D. makes Jonesy her boss, she angrily quits, leaving him to find out rather quickly that Jonesy isn't qualified for the job. As a result of the bind he's in Jonesy is able to talk J.D. into rehiring Erin and giving her a promotion and a raise after he realizes how important she is to the company.