You need to figure out if this is just anti-gun emotions, or if there is something else going on. If its just your basic anti-gun thoughts proceed as others have suggested. If there's something else going on you'll probably need a different approach. I don't know you from Adam, but considering the history you've shared I would wonder if she's concerned about the money that you're spending. Depending on what the true problem is you might give some that to counseling.