Canonically Reina chilled out over the course of HW, with a brief moment of absolutely savagery when confronting the Heaven's Ward and Thordin. Shortly after that she Fantasia'd to further distance herself from her past, and to start a new life her friend would have been proud of.
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In this AU, that moment instead caused her to completely snap, embracing the thought that if she had only acted on her instincts and desires then he might not have died because there wouldn't have been anyone to kill him. And then Stormblood happened.
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She was already withdrawing from the Scions due to them not approving her "Lance first, questions never" philosophy and then she saw Yotsuyu from afar. A beautiful woman, embracing her savagery yet keeping an air of beauty and control? She was obsessed instantly.
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