I think Shadowheart has good stats now that reflect her character well. Daggers and a Crossbow fit a Trickery Cleric like her the best thematically. Daggers can be concealed and that's what you generally use with poison, which Trickery Clerics get at level 8 with Divine Strike. If Larian handles that ability like other poisons and applies it to both hands, dual Daggers will also give her a good damage output. Then there's Broodmothers Revenge which synergizes with dual daggers and her healing spells. I imagine she would fight like Loki, not with some clumsy warhammer.

They need to upgrade her custom armor into a Breastplate though so it doesn't get switched out with the first Scale Mail you find. Her armor even looks like a Breastplate more than anything else. If Lae'zel gets a Half-Plate I can't see why not.