Willett had told viewers on Monday night's (February 13) episode that she inherited her love for music from her father, who accompanied her to the audition.
"My number one fan is definitely my father," she said before auditioning. "The relationship we have is insane friendship. He can be one of my craziest friends as well as the biggest mentor. He is awesome."
Willett said that her father had been diagnosed with stage four pancreatic cancer shortly before her audition. He passed away in December.
Speaking to reporters on a conference call, she said: "It was just a crazy experience just watching him on the TV and it was awesome to see him. So many conversations happened behind the scenes and he was just so proud of me.
"It's kind of weird not having him here now that the show has aired, but it's kind of something I know I can hang on to forever. I know he had such an impact on the people around me on the show.
"I remember sitting with Jordis [Unga] and talking to her and she was sitting there crying next to me when everything was going on."
Watch Erin Willett's audition below:
Willett continued: "You realise how much of a support everyone is to each other on the show, it's kind of like a family because you get to spend so much time together.
"Our family was out there filming with us, so it was really great for him to be a part of this experience, going with all the cameras and being at the blind audition as it happened."
She added: "He was so proud of me and it's awesome he was able to see that."
As for her experience of the blind audition, she said: "I didn't expect as much second guessing. You only see what happens on television and you forget that there is a lot of hanging around and waiting and marinating on your decisions - did I do that right? Did I do that wrong?
"I think all that second guessing was something I wasn't prepared for, but then you have a sense of confidence about it all because you realise you're one of very few who gets to be part of this awesome show."
The Voice airs Mondays at 8/7c on NBC
Watch Erin Willett introduce herself below: