In a round about way I could kind of see it. There's a lot about Shadowheart's behavior that makes me think she doesn't really trust her god or cult. (understandable given that Shar's one of the entities that least deserves anybody's trust) So it could be like that one story arc in Slayers where a fragment of Shabrinigdo allowed Lina to call on his power in order to destroy him...
maybe a roundabout call for help?
