The contact owns a 2024 Buick Encore GX. The contact stated there was an abnormally strong foul odor inside the vehicle, and there was mildew and mold inside the vehicle. The vehicle was taken to the dealer to be inspected. The dealer informed the contact that the failure had occurred due to the design of the vehicle. The dealer informed the contact that water and debris were entering the vehicle through the gap between the windshield and the cowl. The dealer was currently cleaning the vehicle with mold removal products; however, no assistance was provided to correct the gap between the windshield and the cowl. The dealer advised the contact to park the vehicle in a garage. The vehicle was not repaired. The contact stated that her daughter was asthmatic and was taken to the hospital because her asthma might have been triggered by the mold and mildew inside the vehicle. The manufacturer was not notified of the failure. The failure mileage was approximately 6,500.