We have no idea if the Darkhold is even in play. Hell they have never even gone really into the Book of the Vishanti yet in Strange's lore. We are going on costumes that change all the time and eyeliner. All we have actual confirmation of is what has been in actual marketing and so far it pretty much counters Wanda being a villain. From what Hollywood Reporter has posted there will be other universe versions of the main cast, so there is likely more than one Wanda. But it isn't worth going into until we know what is really going on.