If they've already been exposed, giving them the vaccine now won't do much. But, they really should have the vaccine every three years at least. If your county requires it every year, do it every year. But, even in the one year counties, the vaccine is the exact same one given in five year counties. One year vs five year depends on how likely an animal is to be exposed.
I'm sure they're fine. But she really should keep them vaccinated. You can call animal control in your county though and see how many, if any, rabies cases there have been reported in the county. Rabies really is quite rare.