Board Thread:Versus Debates/@comment-32457608-20170826124246/@comment-25122992-20170826135842

Yep, that's even better then I expected, especially the second option. Then, I'll add some more.
 * Kaguya turns into rabbit monster and swallows Itachi as a whole.
 * Kaguya drops the acid from acid dimension on Itachi's head by opening a portal above him.
 * Kaguya uses IT, wraps Itachi into God Tree's roots and turns him into her White Zetsu minion.

P. S. Besides, if Kaguya is theoretically able to open portals in-between the Earth itself, there also should be a plenty of creative deaths she can inflict on Itachi.