If she can be convinced that a mother killing her own children is morally acceptable, she could be convinced of anything, and has probably also swallowed all the other globalist talking points, like that marriage is cis white hetero patriarchy white supremacy, meant to enslave women, an outdated and egregious mode of humanity that must be destroyed. She's thoroughly brainwashed and damaged.

The only thing that can change someone like that (toward becoming better) is a lot of pain, sustained over a long period of time, in one form or another. Fortunately, these people's beliefs and habits are so self destructive and wrong it inevitably ends in misery. Unfortunately, they hurt everyone around them, too. Also, depending on their crimes and behaviors, I don't think I'd be willing to accept many (most?) of these people back into a functioning society, community, group, or family, even if they were reformed. God may forgive them, in death, but I'm extremely hesitant to do so, in life.

She's also not that attracted to her bf in the OP.

If she was, she'd be adopting his hobbies and abandoning hers that he disapproves of.

She's just keeping him on the backburner for resources.