The music teacher sang a rendition of Radiohead's 'High and Dry' for Over 25s mentor Sharon Osbourne and guest Judge Robbie Williams at Sharon's Los Angeles home, but unfortunately did not manage to give a perfect performance for her place in the final 12.
Showing off her musical talents, Andrea, 27, began her showcase by playing the flute before tackling the song.
She said: "My music and my performing, it's my life. It is a risk to play my own instruments, but it's who I am, it's part of me.
However the nervous singer reached too high on the final note, leaving Sharon and Robbie in disbelief and Andrea convinced that she had ruined her chance.
"Two of your dogs passed out on that last note," joked Robbie.
Sharon added: "She is very creative - but that last note, if we were live..."
She is a real artist.
Sharon Osbourne on Andrea Magee
While delivering the bad news, Sharon told Andrea she was a very "creative" singer but felt she was too much of a "niche artist" to risk bringing her further in the competition.
Also receiving bad news in the Overs category was fan favourite Joseph Whelan, who was devastated to be sent home before the live shows two years in a row.
The father-of-one - who made it as far as Bootcamp in 2012 - performed 'I'll Stand By You' by The Pretenders for Sharon and Robbie.
"I love him a little bit," admitted Robbie. "But I don't know where he is going to go (in the competition)."
After receiving the bad news, Joseph told host Dermot O'Leary: "That was worse than last year."
While Zoe Devlin was also told she had not made it through to the final three, prison guard Sam Bailey, student Lorna Simpson and white van driver Shelley Smith were all put through to the live shows.
Speaking about getting her place, bubbly Shelley said she was "absolutely overwhelmed".
"I feel unbelievably proud that Mrs O sees something and believes in me," she said. "The X Factor has given me the opportunity to shine."
I love, love, love his voice.
Louis Walsh on Paul Akister
Meanwhile there was huge shock in Louis Walsh' Boys category as hugely popular Paul Akister was told he was not in the final three.
Paul sang Paolo Nutini's 'Last Request' for Louis and his guest Judges Shane Filan, Nicole Appleton and Sinitta.
Following his performance, Shane told Louis: ""He has got an amazing vocal and it was a great song choice - you have got a very tough decision."
But Nicole added: "He definitely has more to give.
"There is something missing and that's what is giving me a brain block because I don't exactly what it is."
Louis chose to put Sam Callahan, Luke Friend and Nicholas McDonald through to the live shows, leaving many viewers shocked that Paul was not in the final three, with one fan writing on twitter: "Louis, big mistake on letting Paul Akister. You've let a great one slip through."
But Louis has stood by the decision, commenting: "I changed my mind constantly about him. He had an amazing voice, but he didn't have the stage presence. In the end, I had to consider that.
"I think in a year's time, he will have that and he will be brilliant - but I didn't want to put him through and him to get voted off in week one or week two.
"I told him my reasons and that it was the right thing for him. But it really was the hardest thing to say."
The fate of the Girls and Groups categories will be revealed on Sunday from 7.10pm on UTV.