The actress, who has been on the judging panel since the first series, feels she has been frozen out of the ITV1 show as the former Strictly Come Dancing judge has featured more prominently in recent episodes.
Bosses are said to have re-edited tonight's show to include more footage of Holden following fears she could quit altogether.
"Week after week she has had hardly any screen time while the cameras gaze longingly at Alesha. Amanda isn't usually one to make a fuss but she's been really upset about it," a source told The Sun.
"She had to miss some auditions as she was having her baby so she didn't expect to be in every scene. But even when she's on the panel she's hardly got a look-in. She's made it known that it's not on."
Another source insisted that Britain's Got Talent has "no agenda" and claimed it's just the way the show has worked out.
Holden was apparently worried that Dixon didn't like her after the singer snubbed an invitation to her birthday.
Britain's Got Talent was recently rescheduled to avoid clashing with The Voice UK on BBC One.