Exposed Turn Card Ruling

[JustASpectator]

In a heads up pot (flop of Q T 8), it was checked to me (w /A5o) and I bet out. While my opponent was considering her play, the player who was the dealer that hand burned and laid down the turn card (7). It was ruled that the 7 would be dead, and the next card would be the turn card. My opponent called my bet. The "second" turn card was an Ace. My opponent checked, I bet out, and opponent moved all-in. After thinking about it for a while and trying to talk myself into folding, I called, believing (ok...hoping) my opponent had KQ or QJ. She had KQ. The river was a 5, giving me Aces up, and she was eliminated. After the tournament was over, she said it should have been a misdeal. I know a misdeal (do-over) couldn't be the correct ruling. But was the ruling that was made correct? Or should there have been another "burn and turn" instead of just a "turn"?

Thanks in advance for your responses!