The link to her "huge disappointment" will answer that question.
Time to Celebrate!
What a relief for you! You're more polite than I am, I'd be demanding answers from her supervisor as to how the error was made in the first place. You shouldn't have gone through such worry. Still, you have the good news to focus on now.
Remember when you're studying for the exam and your brain gets a bit tired, stop - take a wee break and share some Christmas cheer and you'll be ready to tackle it again.
The next "good news" post I want to hear from you is "I passed! It's official!"