Just putting it into perspective
Yes, she has lost 11 times, but in more than 1000 years...
One was a demon that created the first magic specifically made to kill, the other one an elf (considering how rare they are probably another millenary elf maybe even before becoming Flamme disciple), and probably one of those humans being Flamme in a duel, the most powerful mage.
Judging by how her duel with Aura went she probably believes the competition is going to be as strong as those ancient mages or something.