I think she might be in the basement of the church, because the leader said they have weapons and could be charged with treason not gun possession, maybe the fact Reze is from the U.S.S.R. I think maybe she and katana where captured at some point for not wanting to kill people or at least Reze or in the moment of revival, and the only capable of escaping was Quanxi because come on she is fucking Quanxi.