Rob87, LOTS of good input here, I'll keep this short.
She's hurting, and wants to lay blame somewhere. Thanks to the MSM, a gun is already seen by many as a sign of evil. It can't argue back, can't debate, can't defend itself, it just sits there, looking evil, so it makes a convenient scapegoat. But don't give up on her. I'm guessing she's relatively young, and somewhat naive. In time she will likely come to realize that all your points were salient, even if they offer no comfort. Liberal at 20, conservative at 40, etc. "I don't need this right now" indicates overload, too many concepts that refuse to mesh. "If you were my friend you'd tell me I'm right and validate my feelings". You wouldn't, and she's hurt by your cold logic, that's not what she wanted right then. Give it time, keep pointing out the fallacies of her stance, and be patient. Logic and emotion don't get along too well, but when she's feeling less empassioned, the logic can sneak in there and open her eyes. Be gently persuasive, and firm. It takes time.
PJ