That's why I was thinking it would be an enhancement to the armor, say you have a suit of +1 full plate. The magic on that usually costs 1,000 gp. If Lesser was +1, regular +2, and greater +3; it would now cost 4,000 for lesser, 9,000 for regular, and 16,000 for greater. Even so I think she would likely wear leather+lesser or hide+regular in any event.