Most Helpful Girl
You don't in your case, just leave her be. Before you cause more damage
Most Helpful Guy
Not sure what the argument was about, but if she is willing to wipe you out of her life over a disagreement then you probably dodged a bullet. That's the best sort of closure a guy could ever hope for. Learn to let it go and get out there an meet a girl who has the gumption to handle you without running away.