The singer exited the BBC One show earlier this year to join ITV1's Britain's Got Talent but said no one influenced her move.
"Nobody can be poached. I make my own decisions," Dixon told This Morning.
"It was a choice I was comfortable with, it felt right. You have to follow your gut instincts on things like that."
Dixon also addressed rumours that Simon Cowell wants her to join The X Factor if Kelly Rowland doesn't return.
"They haven't asked me," she said. "I couldn't sit next to Louis though, I'd have to sit next to Gaz - no, I'm only joking!"
Cowell apparently wants to poach Jessie J from The Voice UK following her success on the BBC show.