So my gf went on a shopping trip with her mom. I had her car. Get there to give her her car back around 20mins after they get back....her moms car is completely dry during a storm. Asked indirect questions regarding the weather and she confirmed the rain. Like I said car is dry, not a drop on the garage floor. Now her dad does have a truck as well but it was piled with trash.and they both loath driving it. The question is, how do I ask/call her on her shit without sounding insecure?