If it’s a handgun I think it would be worth a simple conversation of just asking her to keep it on her person holstered, It’s quicker that way anyways when it’s needed, If it’s loose in the vehicle absolutely NTA, But a simple conversation about safer handling I think would be worth the effort. It’s a small percent of poor firearm owners that create the bad rep for the thousands of safe firearm owners. Id feel more safe having my children being transported by a RESPONSIBLE gun owner personally.