If she is going to rely on pepper spray over lead spray, go with the strongest legal in her jurisdiction. Regardless of the firearms and pepper spray laws, she will run afoul of game laws for wildlife violations. The secret will be to treat it just like Mas advises in any self defense situation, and yes, this is self defense.
P.S.
Only go with the stuff postal carriers use if that is all you are allowed to use. It is pepper spray, but it is among the weakest of the sprays available.