Bojack Screencaps from s06e10
Diane's stays this size through the end of the season/series. Her weight gain is never overtly commented on (except the one time she mentions her boobs are heavier), which is actually refreshing. Her taking prescribed antidepressants is framed as a positive, regardless of the effect on her weight. In this episode however, she struggles with the fact that - as she sees it - the medication is preventing her from accessing her traumatic childhood memories to write her memoir. She ties her success as a writer to being "sadcore" and briefly goes off her meds until her boyfriend intervenes. She ultimately accepts that she doesn't have to be in a dark place to be a good writer and decides instead to write a mystery novel for middle-grade girls with the encouragement of her boyfriend and her agent/manager. This is the only real Diane-focused episode; by the end of the series though, it's revealed that she winds up getting happily married to the boyfriend and moving to Houston. Overall, she's framed as having become a much more well-rounded and healthy person.