Remember that if anything bad happens, as per the updated OSHA guidelines, any loss of ability or loss of life as a result of getting a mandatory vaccination is considered a workplace injury. Your wives health and well-being is the responsibility of her employer now. And they must pay out in the same manner they would if it happened in the workplace.

Hope it doesn't come to that though. Best of luck!

Edit: It should go without saying that she should have a full and in-depth examination done beforehand, just to show that she is in perfect health.