Plot Needs Work
Okay, I'm going to be completely honest. As a victim of sexual/physical abuse at the hands of a man myself, I really hate reading stories that depict victims as weak and in need of a man to rescue them; especially if that man is cold/callous and a borderline abuser themselves. It just puts out a really unhealthy narrative that I see a lot in werewolf stories that glorify abusive relationships and sexualizes victims. That being said, I think your heart is in the write place and you're not trying to glorify abuse/sexualize victims or anything like that. So, my advice would be twofold:
Read the story now
1) I want to see the female lead as a heroine, not a damsel in distress. Obviously, abuse breeds trauma so I wouldn't expect her to be totally fine at al - in fact, I really like the idea that she can't speak becuase a lot of victims of abuse to experience that. I would like to see some more aspects of PTSD in her character to really drive that through, but not in a "look how pathetic she is she needs the Alpha to save her", but more from the standpoint of she has survived something awful and now needs to find a way to find herself again; and rather the Alpha doing that for her, he needs to stand by her. I want to see a lot of growth with her that comes from within her. Obviously, she's going to not be strong at first (I certainly wasn't), but I also wasn't a damsel, and jumping right into a relationship after abuse is NEVER a good idea, but that reality can be suspended for the story.
2) I would change Caine's character a little bit. I think that the trope of "tough guy turns soft" is used a lot in werewolf stories, and that premise in and of itself can be good. There's a fine line though between "tough" and "abusive", and I think this story really teeters on that line, especially when the protagonist suffered severe trauma. I think maybe if Caine has his own trauma that also makes him more reserved and unfeeling, that's okay, but perhaps not aggressive? That way abuse isn't glorified or sexualized; and you should show him as seeking help for any borderline abusive behavior as he doesn't want to hurt his mate, sees he has a problem, and does something real to fix it.
I don't know if any of this makes sense, but just from my perspective as a survivor of rape and intimate partner violence, stories like these really trigger that trauma for me, and makes me feel like I'm not being depicted in a good light. IDK if any of this makes sense, please let me know if you have any questions because I think the writing is amazing - you're very talented, that's for sure - I just think the plot/characters need to be changed.
Also, I'm a little confused as to why they blame her for her own parents' /packs' deaths? It seems like kind of a leap, so maybe make them mad at her for a different reason? But I guess a crazed Alpha who would abuse people like that it's super logical, so maybe make him make up a reason to the pack for them to hate her so they get on the hate train, even though it's not true and he's really just a sadistic weirdo.
Don't be discouraged by this please, I'm just being brutally honest from my point of view and you can of course disagree with everything I'm saying, because it is just my perspective and probably not everybody's.