Every time I'm trying to convince myself that she's trying hard to cope,
she throws a hissy fit talking about how unfair it is that she “lost” everything
this is exactly how I feel. Everyone else had issues long before S1. Her other sibling all were an outcast and experience hardship at some point. They didn't turn around and just blame their family. So even tho Allison had always been an "ugh" for me, S3 just nailed the coffin.
S1 she rumored her kid. Screams bad parenting, and if I catch my spouse doing that, I'd divorce and run away asap. Terrifying. She also seemed to have a bad time handling loosing her fame and special treatments and being liked by everyone, which lead to S2
S2 I just love the fighting civil right at Texas 1961, it's just wow. But it always felt kinda off. While everyone else were standing up for themselves for their collective equality (because it's the right thing to do!), I can't help but feel Allison was there also because she herself was /entitled/ for better treatment. The feeling is difficult for me to verbalize (sorry and English not my first language too). But like in comparison, Klaus was a somewhat insane looking homosexual man, which didn't fly well at the 60s, but he was a lot more chill to those people.
S3, the nail in the coffin, the entire S3 she just wanted to hurt people physically (with Diego at club should be foreshadowing) and emotionally.
With Allison blaming Viktor for everything from episode 2 through 9, despite Viktor had been supportive at her. She proceed to kill Harlan (when Viktor trusted her would take care of Harlan while he sort things out) and expressed no remorse at neither of them. She rumored Luther despite 1. knowing he used to have a thing for her but she wasn't interested 2. knowing he had moved on to a new relationship and 3. she doesn't love him but just want his company. I don't even like Luther but can't help but feel bad. Just screams manipulative and non-con.
Allison especially S3 just left a really bad taste in my mouth. And knowing she had been hurting her family and still managed to get Ray & Claire back (who she rumored so she doesn't have to deal with kids being kids). For S4 I'm just expecting an redemption ark or her loosing everything again because S3 had set her up to be an unlikable character. My guess is she have to decide rather she can have Ray and Claire, or the rest of her siblings can be happy again.