Well, the point of brining is to add moisture to the turkey, so it doesn't seem outrageous that the skin would be that much harder to dry out, as well. Tell your mother that her cooking is incredible, that you can't imagine how it could ever be improved, and that you dream of the day when you are half the cook she is. Then, while her back is turned, pop the oven temperature up to 400°F to 450°F (205°C to 235°C) for the last 20 to 30 minutes of roasting to crisp the skin.

You just have to learn how to work with people. It's not rocket science, you know.