The major question I have then is why does there need to be a change? Resolving mental health issues is a big thing, it's not simple and it's very difficult to even get going on that road.
To compare to another staunchly feminist show written by women and about mental health issues which I evangelise about - Crazy Ex-Girlfriend - At the end of series 2 Rebecca is no closer to being fixed than she was when she fled her New York life at the start. If anything she's slid further back thanks to the events of the series 2 finale. This is realistic, just like Jessica not dealing with her problems, and not getting the right support or good advice from her friends (who to be fair are a talk-show host with unrealistic ideas about life on the streets, a cold and manipulative lawyer, and a junkie).
The idea that a show has to have their character grow, address and start to fix their problems has some merit, but I don't think every show has to do that. And I think it's better that shows where mental illness as a core theme show just how destructive and awful it is, and that there are no simple solutions. To have Jessica end series 1 in a better place than she started would have been to betray that part of the show's core principal, no matter how narratively satisfying it might have been.