We could modify the dmfi_destroyobject tool to work with this wand, and have a flashy, random vfx when it consumes an item.
Secondly, there can be a 1% chance of it spawning a few useless/useful item as a result.
Actually, there is a default nwn item that does what we're looking for, and it can restore the charges on any item- we can tell her to use it exclusively on what we give her...