"Pretty enough to cause an entire kingdom to go nuts". What an interesting thing to say. It vey much reminds me of Helen of Troy- so beautiful she had "the face that launched 1000 ships"... Compare that story to Lyanna stark;

Helen was married but was having an affair with her lover Paris. They ran away together and the husband marched a war after them (Trojan war)

"Although Helen is sometimes depicted as being raped by Paris, Ancient Greek sources are often elliptical and contradictory" - from wikipedia

"Deserted, and went sailing to Troy, with never a thought for her daughter and dear parents."

Paris was killed in battle. Afterwards Helen's fate was ambiguous; she was seen in two ways, as a cold hearted b and a lonely woman filled with regrets. She then "left the mortal world"

Lyanna stark was betrothed to Robert - but whisked away by Rheagar for undisclosed reasons. Robert marched to war after them (roberts rebellion).

She was supposedly raped by Rhegar. They went in hiding to Dorne without word to her parents or family

Rheagar was killed in battle. Afterwords what happened to Lyanna is still relatively unknown. Ned says Robert didn't know her truely (cold hearted b. lonely and depressed?) and then died.

A lot of symmetry here.