What's worse is that Masumi Hayami is known for being ruthless and cold-hearted. He is known for treating actors and actresses like commodities, something even he admits. Tsukikage would have known this. And yet, she still signed Maya over to his company. That is very clearly exploitation of the worst kind.
Her death partially redeems her but it further complicates the turbulent relationship she had with her daughters. They now have to overcome the abuse they suffered at her hands while remembering the fact that her last act was selfless.
It is difficult to find a balance between showing realistic depictions of peoples' reactions to a crisis (which may often be selfish) and also depicting a character who puts themselves aside for the greater good. While Anna, in this scene, definitely prioritises the greater good and doing the right thing over herself, she is still hindered by the guilt she feels at learning of Elsa's "death".
I love redemption arcs for victims of abuse. I think they serve as a wonderful message. A beacon of hope. But not every abuse victim has to be redeemed. Especially in a show that has other victims of abuse who break the cycle, it's fine to have a character who doesn't. It's sad but it also serves as a message to kids.
This is one of the few movies where I am fully siding with the parents. Jaime is, at times, cruel. Honestly, I don't think the boundaries her mother has in place are unreasonable. Jaime is a teenager living in a town filled with weirdos. Case in point: the very fact that someone murdered her mother over such a stupid reason (a reason I won't disclose as I think you deserve to find out on your own).