question, and what I'm up to

The ninja girl has a question about Patricia Wrede's Enchanted Forest series. I read some books in the series and enjoyed them, but I have a notoriously bad memory, and I didn't read all of them, so I'm putting the question to you.

The magician character [quick Google search... ], Mendanbar: the ninja girl remembers an occasion where he (or possibly someone else??) creates a duplicate person/doppelgänger of someone, using magic. Does anyone remember such a thing? And if so, can you situate that p...