Every poll? Many polls had Trump ahead. On average she had a 2-3% lead, and won the popular vote by 2.5 percent. It was only how the vote split in the Rust Belt that decided the election. The polls were not far off. They are only estimates anyway, not infallible predictions.
Since November, polls have predicted the far right would lose in Austria - they did. Polls predicted the far right would lose in Netherlands - they did. Polls showed Le Pen and Macron would be top two in France - they were. Polls now showing everyone will gang up on Le Pen. They will.