Smack her upside the head and drag her by her hair back into the kitchen.:P
Okay don't do that, now I am gonna get smacked. Just try showing her this forum. A good bet would be to take her to any open carry events, be they picnics or protests or whatever. Maybe seeing other people openly carrying and all the unarmed people around them whom it obviously doesn't bother will at least help her be more comfortable with the idea.