I agree with a lot of things being said here but I also have another point of view

I can imagine Gina feeling like she actually is doing the work so they should be treating her with the respect for it. After seeing Bojack being high all the time and frequently not showing up to set, I can imagine she feels like she should be entitled to some respect because she is a hard worker (outside of the triggers and the trauma, which is definitely also a big part of why she was acting the way she was acting).

She saw how Bojack was handling stuff in a casual way without any reporcussions, so her putting the work in made her feel like she should be respected for it.

I think this and the trauma exists at the same time and they reinforce each other, like in the way when she got triggered during the dance scene and she tried to pull rank afterwards. She felt like she could leave because it’s definitely what happened a lot with Bojack and possibly other stars in the other shows. She probably felt entitled to also do this at that time.

It’s been a while since I saw those episodes so it’s possible I’m overlooking some details