Brake Disc Caliper problems of the 2015 Nissan Pathfinder

For approximately the last month there had been a shimmy on the front end. When taking it to be serviced at the Nissan dealer there were 13690 miles on the car. The car is primarily driven locally a couple of times weekly because the owner works from home. The service center came back and said there were no front brakes left and was surprised we had gotten in. When asked how this could happen after so few miles the service manager said the driver must have a heavy foot. The driver is a 59 year old woman who only drives locally. The brakes and rotors were replaced. Nissan corporate was contacted. Their customer service manager came back and stated that the brake fluid may have broken down. Both explanations are implausible. A regional customer service manager called today and gave no other explanation but stated since the car was 14 months past warranty they would not be responsible. We have since contacted two acquaintances who are mechanics and both said Nissan's explanation is not plausible. This affected only the front brakes and the calipers were unaffected. We can send a copy of the service bill if needed.