I think that she's going to lose it when Sloane goes bad again and blame Syd. I think that's going to lead to a fight between them. I think that Nadia's going to try and shoot Syd but Irina's going to dive in front of the bullet to save Syd (and save Nadia from killing her sister) and sacrifice herself. I think that will bring Nadia to her senses and she'll be so overcome with grief/guilt that she runs off. Seriously, that's what I think is going to happen and no, I don't have any spoiler knowledge to back it up.
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