^^ I don't think Idril was thought of as Turgon's heir. One of the stories that Maeglin's mother told him according to the Silmarillon is that Turgon had no heir. I don't believe that it is expressly stated but that phrase seemed to imply that Turgon's lack of a successor was one of the things that Maeglin found interesting about Gondolin and may have motivated him to go there.
With respect to Rune's original question, I think that Idril did the best that she could in the circumstances. Turgon did not want to leave, not merely because of Maeglin's counsel but because he himself had fallen into the trap of loving too well the work of his hands. Perhaps Idril had already tried a more direct approach, trying to get her father to listen to Tuor's warning and having failed at that she went to plan B.
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He looked down at her in the twilight and it seemed to him that the lines of grief and cruel hardship were smoothed away. "She was not conquered," he said
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