The name was very common making it often difficult to identify the queen in the ancient sources as there were also other high status women with that name.
[1] Nin-kalla is mainly known from economic texts showing that she was in charge of land and its staff.
Nin-kalla was most likely living in Nippur, while she traveled for religious festivals to Ur and Uruk too.
[2] From different texts it seems clear that she was running the palace at Nippur in the latter years of Shulgi's reign.
Nin-kalla survived King Shulgi and retired to Nippur where she was still in charge on estates, some of them heavily involved in wool production.