>>537710068
Duchess has 42 int and I believe an A scaling in it? Recluse has 51. Revenant comes in third at 30. Duchess also has 40 dex with a B scaling, meanwhile Wylder of all people has 41 with a B scaling as well.
You should *technically* be prioritizing sorcery on her, yes. That's not to say daggers are a bad build by any means. The "Dagger Chain Reprises Restage" relic is incredibly good.
She has a pretty good FP pool but it'll go by pretty quick if you're charging big spells, so try and snag some shards if you open a rise or are around churches.
Most bosses have middling resists against magic so it doesn't really matter in the end. Overall, you should be playing her as a spell sword that leans into spells.