What were some scandals of Marie Antoinette?

Answer 1

The failure to keep her country wealthy; France became very poor because of the debt the Queen put the country through, and the spending of money which was unecessary, and which the country did not have.

Answer 2

She was a woman.

But even worse, she was an Austrian Woman.

Answer 3

Well, the Diamond Necklace Affair was probably the biggest; pretty much everything else was petty, baseless speculation.