But no one was more upset that Eden's mum Juliearna who flew all the way from New Zealand to support her daughter and was seen on screen saying: "Are they deaf? That's nuts!"
"I think the mama bear in her came out," laughs Kavanagh. "She's one of the most supportive people ever, it was amazing to have her there."
While grateful for the support, Kavanagh isn't actually that bothered she didn't make it, saying: "I couldn't be happier."
The Kiwi songstress went to visit her father and brother in Ireland for some downtime after completing her Bachelor of Performing Arts at Whitireia Polytechnic in Wellington.
They were the ones who persuaded her to audition, sending her on a journey some eight months long which saw her film hours of interview footage and endure dozens of auditions against hundreds of other hopefuls.
"All that for 90 seconds on stage," she muses.
While the judges didn't turn for her, Eden says the feedback from fans has been "absolutely insane".
"I didn't expect it at all. You never know how they'll portray you on one of those shows but they actually made a really nice segment. It was quite lovely how they got me across to the public. I couldn't be happier to be honest.
"It was cool, everyone was so nice - even the other contestants; we all got along so well. It was good fun."
For Eden, who's been singing since she was just a child, "it's all kind of just been building up to this".
Now back in New Zealand, Eden is ready to kick off 2019 but doesn't have any major plans - yet.
"I'm just seeing where this road takes me and what doors open - if any."
Watch Eden's full audition video below: