She was Helen of Troy. So it was Troy. __ Helen was NOT from Troy originally. She was kidnapped from Sparta, her husband Menelaus was the king of Sparta. Paris of Troy either kidnapped her, or she fell in love with him and ran away with him (depending on which story you read) and they went to Troy.
Helen Maria Ashdown has written: 'Helen of Troy in Greek literature from Homer to Euripides' -- subject(s): Criticism, textual, Greek literature, Helen of Troy (Greek mythology) in literature, Helen of Troy (Greek mythology)in literature
I think you mean "She is no Helen of Troy." It basically means that "she is not the most beautiful woman on Earth." Helen of Troy was considered the most beautiful woman ever to have set foot on the Planet.