I am going to dissent here
You can keep trying to convince her, but you also need to do what you need to do. Of course, I would respect my aunt's rules, but I would expect her to respect me too. Hopefully you can come to an understanding. If you are living there as a tenant though, and you want to keep a handgun, for example, but not ruffle her feathers, get a firesafe, bolt it to your desk or whatnot, and keep your gun in locked up in there. You need to have a safe place to store your money, passport or whatever anyway and that is all she needs to know. That would ensure your privacy and safety etc.
Shooter429