Given that she dramatically underperformed the other two statewide Democratic candidates that ran against insane Republicans I would say that it and her other mistakes impacted the outcome.
Or Lake, the candidate more used to being in front of a camera and manipulating the media, could have gotten a lot of momentum off the debate and won.
Then again Oz still lost despite easily winning his debate, so perhaps the real lesson here is simply that debates don't matter?
Also she actually outperformed the Dems running for AG and Superintendent.