At the start of season eight in The Big Bang Theory, Penny quits her job as an actress and becomes a pharmaceutical rep in the same company where Bernadette Wolowitz works in. Apparently, she's good at her job, so much so in S8 E20 The Fortification Implementation, Leonard discovers she is earning twice as much as he does
Penny: Okay, instead of protecting me, why don't you try being excited when something good happens?
Leonard: I'm always excited for you! I'm excited that you found this new job where you're making decent money.
Penny: Decent? I make twice what you make.
Leonard: Wait, twice?!
Wheaton: For those of you at home, Leonard just found out his fiancée makes way more money than he does.
Penny's lucrative job as a pharmaceutical salesperson is briefly mentioned in the following episode, "The Communication Deterioration" and then... never again. It is now season nine, eleven episodes have been aired, and not once does anyone mention about Penny's work. Not her husband, whom we see still works in Caltech, not Bernadette who is her co-worker, nor Penny herself. Penny's past as an aspiring actress who waited on tables in the Cheesecake factory is never mentioned either. I realize that as a character, Penny could not continue waiting at tables forever while attending the odd audition. The writers either had to give her an acting break, or she had to ‘give up’ her dream and find a job that offered her financial security. And it's great that the show has two strong female characters who excel in their professions, so why have the writers ignored Penny's career in season nine?
Have the show's writers and producers justified their decision to write all of Penny's scenes either in her apartment or at Sheldon's? She doesn't appear to go to work, she never talks about her clients, her boss, her old dreams of being an actress, nor her dreams about the future. She doesn't say whether she loves or hates her new job.
What exactly is her role in the show? Is she just Leonard Hofstadter's wife?
Despite the fact that she has this financially rewarding job, it hasn't been mentioned since Season 8 episode 21, which aired April 16, 2015. Why would the writers stop talking about Penny's “new” job?