Knidos made a well-known statue of this goddess, who can only spend two-thirds of the year with her daughter due to that daughter eating a pomegranate.  
She appeared to Celeus as an old woman named Doso, but Metanira foiled her attempts to make Celeus' son Triptolemus immortal.  Euripedes' fate is discussed by a group of women attending this goddess's festival in an Aristophanes play, and another festival in her honor was held at Eleusis. Knidos made a well-known statue of this goddess, who can only spend two-thirds of the year with her daughter due to that daughter eating a pomegranate.  For 10 points, name this Greek earth goddess, the sister and mother-in-law of Hades, and mother of Persephone.
She appeared to Celeus as an old woman named Doso, but Metanira foiled her attempts to make Celeus' son Triptolemus immortal.  
{Demeter} (Ed: Not Diana)