From A Wiki of Ice and Fire
Cersei, Melara, and Maggy. Artwork by Cris Urdiales, used with permission.
|Born||In 265 AL|
|Died||In 276 AL|
|Book(s)|| A Feast for Crows (mentioned)|
A Dance with Dragons (Mentioned)
Melara Hetherspoon was a member of House Hetherspoon.
Appearance and Character
Cersei describes Melara as a girl older than Jeyne Farman. She is contrasted to the "fat" Jeyne, implying she was slender or outright skinny. Melara was pretty, though she had freckles. The girl was "healthy as a little horse".  Cersei has troubles recalling what Melara looked like, as the memories faded as the years went by. 
Cersei thinks of her as bold, certainly bolder than Jeyne and possibly bolder than Cersei herself. 
Melara was present when Maggy made the prophecy of the valonqar to Cersei Lannister. Melara (then aged eleven) visited Maggy with Cersei and Jeyne Farman after hearing whispers that she could tell futures. Jeyne fled when Maggy opened her eyes to greet the visitors, but Melara and Cersei stayed and insisted on hearing her future.
Melara asked if she would one day marry Jaime, but Maggy told her that she would die that night, and her death was close. Many years later, Cersei told Taena of Myr that Maggy's prophecy had come true: Melara drowned in a well. It is implied that Cersei herself killed Melara by pushing her into the well and leaving her to drown.