Is it really calling another instance of yourself, without some kind of cloning? Like usually that kind of thing is used in time travel stories, where you call a previous version of the character forward, but then there are two of them there. Whereas in this case, a higher existence fell down to a lower level; it's not that she's a weaker Zashiki because of the Fallen title, it's that she's a Zashiki because she fell down from something else, and the new ability is calling back her previous power.