[Interracial couples have higher rates of domestic violence.](https://www.jstor.org/stable/23326036) That would be my angle. Show her pic after pic of beaten coalburners and the assailants that look like normal, gud boi niggers and see if she pics up on the trend.
Women are likely going to love their children regardless, but maybe you can tap into the sense of self preservation. In that regard, you could also bring up the stats of niggers abandoning and/or murdering their children.
Then again, bitches love Charles Manson, even after his conviction. So the learning needs to begin long before the nigger question comes up.