Well, there is always that saying, "It is easier to get forgiveness than permission." I suppose you used that philosophy here.
I'm curious what her complaint is. I know some women are afraid of accidental discharges, children getting hold of the gun, etc. But some women are afraid their boyfriends/husbands might become violent someday when they are drunk and/or angry and use it on them. So I guess you need to figure out which the issue is.