The polls have been wrong but not out by 67% to 33%. That is a 34% difference and all polls have been within the margin or error to the actual votes (even when they were wrong). It is clear that there is overwhelming support for not having another independence referendum.
She has said in the past, before the Brexit vote, that she was building a case for independence again and that she would not go to a vote until there was consistently over 60% people wanting independence based upon polls. So she has used polls in the past to justify her position.