Princess Meng
If it was Princess Meng , then she died in the Northern Wei capital Pingcheng ( 平城 , in modern Datong , Shanxi ) after Juqu Mujian's capital Guzang ( 姑臧 , in modern Wuwei , Gansu ) had fallen to Northern Wei forces and he had been taken captive , but she was still buried with honors due a princess . 
<triplet> Datong <subj> Shanxi <obj> located in the administrative territorial entity <triplet> Shanxi <subj> Datong <obj> contains administrative territorial entity <triplet> Wuwei <subj> Gansu <obj> located in the administrative territorial entity <triplet> Gansu <subj> Wuwei <obj> contains administrative territorial entity