Well, she's definitely not without her flaws, like any human being. And she certainly has a strong stubborn streak in her character, even Lily confirmed that Olivia probably inherited that from her.
But I think what plays a big role here is that we, as outside observers, know more than the character who is inside the drama and doesn't feel what the character is supposed to feel, so our judgments aren't clouded by the character's feelings. She just sees it differently.
Olivia is constantly stressed because of the drama with Sasha. They love each other, but they barely get to spend time together and have to hide from everyone. Keeping secrets from the people close to you everyday is very difficult, so it’s no wonder that Olivia is nervous and rude for no reason, it’s just a consequence of constant stress. She also feels guilty when she skips college to spend some time with Sasha.
She sees and understands perfectly well how much effort Lily puts into giving her children a decent future. But she is torn by the impossibility of telling the truth to her mother (she is afraid of condemnation and misunderstanding), being rejected by Sasha, who is also not delighted with the situation and expresses dissatisfaction, and on top of that, Sasha's asshole father is looming on the horizon.
And to top it all off, there is a complete lack of understanding of why Lily is hiding the truth about her father and does not want to discuss this topic and anger at her, because not knowing the truth, she begins to come up with her own explanations and in her head Lily is to blame for their father's leaving.
As a result, all this accumulated stress, negative emotions and anger spills out into an ugly scene, and by a terrible coincidence, it is on this day that Lily's illness manifests itself. (Which had clearly begun a long time ago)
Of course, in this situation, it looks like Olivia is the only one to blame because she is such a bitch. But is that really the case?
It's really a shame when a vocal minority of malcontents pressure the dev into changing his game. The dev should always just stick to his vision, and fuck the haters.
