Carrying in Car

Hello,

I'm sure this is a tired question as I've seen it on here before, but it's a little different from the normal question of "can I carry it in my car". My girlfriend and I recently had a discussion, as I had accidentally left my handgun in her car, which admittedly is a huge mistake on my part. She said she could've been charged with a crime for this due to it not being registered in her name if she were pulled over, and her dad corroborated this fact with her. I insisted that due to constitutional carry and the fact that she is not considered unqualified to carry, they wouldn't be able to charge her with anything, especially considering our relationship and how easily it could be explained. I was fairly certain that who the firearm was registered to wasn't really a concern in the matter but essentially I just want to confirm this, am I right or wrong??