I'm not sure six feet deep is enough...she might be able to dig her way out.
Well,if she digs her way out, she'll be looking to dine on brains.
She'd be surrounded by Liberals, so it'd be like a bear coming out of hibernation trying to fill it's belly sucking the nectar out of honeysuckle flowers...
I'm not sure if zombies can starve, but that's as close as it would get.