"My partner Moriya, a curse god, provides heavy miracle work; I handle detail work and client development. We share faith; we share a priesthood."
Of one, but that's plenty, especially when she's a demigod who performs some of the miracle work as well. Last she heard from Suwako, who's been puzzling out the local metaphysics, Pharasma had "thrown an incomprehensible shitfit" at the concept of two gods with different alignments sharing a cleric, but they don't even know how to do that yet so it's not a pressing issue.
This guy probably expects divine magic from her, and she's going to have to grant some of her own style of miracle instead, which is the trickiest part of this sales pitch. Worst case, though, she can refine the pitch for whoever has the second nicest office in Pangolais.