User blog comment:Metadwarfosis/In anticipation of volume 11- Dwarven Kingdom and Expectations/@comment-178.175.66.8-20160813130218/@comment-5480911-20160813144809

Actually PDl mentioned as i quate  that girl sleeping deep within the Marine city. Also the manga had clarfied it as a floating Artifical Island City that is located in the east meaning it is far out of reach for ainz at the moment. Meaning more than likely she is either a player in soem kind of deep sleep or an inactive NPC and the city itself is a guildbase of some sorts.