Actually the way it was explained to me is that She just wants to have sponsored channeling, no power of her own. Which is where we came up with the -3 refresh. And Soulfire says there are other elements, just not sure how they work. She doesn't want to be able to do rituals. Since sponsored magic is just like taking channeling and ritual priced at 2 with the sponsored replacing the the usual focus, then one more for Soulair.
Thematically she's basically a champion of god, with magic instead of a sword.