However, based on what I've seen these past 3 seasons, in my opinion, when Melissa's contract obligations are fulfilled she will not walk away but freaking run away.
Of course her starring role in Supergirl launched her career and as an actress and singer she has honed and expanded her talent. She has grown while the show has been stagnant. I think we will see her again but not in these type of shows.
Okay, admins, please forgive me, as I'm about to make a post that doesn't really speculate about the show, but rather how the show has likely impacted an actor's life. The things I'm about to mention are public information, and are not due to prying or digging into their private life.
I mean...yeah, the show has problems narratively. That's not in doubt, but I have heard nothing about Melissa personally having problems with the production, cast members, or crew members. I think "running away" is an extreme interpretation. It's her work with THIS show that gave her not only her first directing opportunity, but an entire workshop on HOW to direct with Warner. It's no doubt that her work with THIS show that built her relationship with Warner and allowed her new production company to cement a contract with them.
It gave her a dear friendship with Kevin Smith, a filmmaker who's films she loved, growing up, and they were close enough for him to attend her wedding. She's also incredibly close to Chyler, which has been stated publicly, many times.
The cast and crew members of this show have been there for her as she dealt with and exited an abusive relationship, went through a divorce, introduced her to her new husband, adjusted her return date to filming so she could make her Broadway debut, and worked around her schedule for her maternity leave, despite an already absurdly long hiatus due to COVID.
Yeah...a large percentage of us have problems with the writing and some creative decisions. But I feel like this show has treated Melissa, as a person, with love and respect, and has given her many opportunities she wouldn't have had, otherwise. For all of these reasons, I don't think she's running away with the intensity you suggest, when the show wraps.