In addition to sizing, the two most important things to consider are environmental factors and access or security.
Now, let’s discuss access and security. Will she be driving the car daily or might the car be stored for short periods? Will the car be parked indoors or outdoors? Some car covers offer a zippered entry into the driver’s seat to access items stored inside. Other car covers offer a locking cable to secure the material against the wind—but this can be annoying for everyday use.