I'd have made the exact opposite decision. That way, even if she is not to ever touch them without permission/been told to, there is no curiosity even if she does find them.
I do this in deference to my wife who, as I said, is afraid of firearms. I do not keep firearms "handy" in the house, so there's no risk of my daughter stumbling across one.
If it were only my opinion that counted, I'd have my daughter at the range at least once a month.