Dude I don't defend Taina's betrayal at all. It was quite massive and the reason of her betrayal is even worse.But I simply don't think she is unredeemable. I think she has fallen in love with MC which wasn't even in her plans in the first place. So all her plans and all of her emotions pretty much fucked up. Don't get me wrong I still think she needs a major punishment at the hands of mc. But I can still see the light of her if they do the things I wrote in my comments. If your question is 'what would be the redemption of the betrayal? I don't know honestly. But for starters one of the first thing on my mind is MC giving her a empty gun and order her to shoot Megan. If she pulls the trigger than it seems we are on the right pathLook man, you like Taina, I get it, I used to like her too, but why on earth would anyone want to play the third wheel in an already established relationship of two women who already tried to killed him multiple times? Oh, yeah! Taina never tried to kill him directly, she just let the people who'd do that run free... Twice!!!
If Megan was her sister I'd might give her a small chance of redemption (blood is thicker than water and all that), but putting the MC's life in danger and pretty much not giving a fuck for all those people who were either sold as slaves or died in the process, for someone she fucks... Well, let's just say that doesn't make her look good or worth of any trouble. And like I said, she did it twice, so even if she was too naive the first time, it's not like she didn't know there would once again be casualties the second one! But fuck them because Megan's pussy is sweet, right? Yeah, even a bullet would be too good for her.
Also I don't think you currently a third wheel with megan-taina. Considering Taina let them escape under the condition of them never ever return to the city, It's clear that she wants to be with you. Otherwise she would've go with them or simply kill you to be with them. Yeah Taina is extremely stupid to believe that they will never return to the city but then again it's her being stupid to act with her emotions not her wanting them to kill you. Now she has to prove that she only loves you, she is only loyal to you and prove that she break everything up with Megan and she doesn't love her anymore at 'that' way. I stand my point. I think she needs another chance