Thatcher was dropped from The One Show earlier this week following comments she made off-air, in which she referred to a tennis player as a "golliwog". The broadcaster said that it hoped Thatcher would issue a full apology but that she had declined to do so.
Thatcher's representative Ali Gunn claimed that there was an "agenda" in her removal from the show and suggested that the BBC should apologise to her.
"Obviously they know what their agenda is and there is certainly an agenda behind this," she told TalkSport.
"I would like to say that this comment was made in jest afterwards in the green room over a drink and no one objected to it at the time. I think it's absolutely outrageous that the BBC has condoned this leak."
She continued: "They haven't even disciplined the member of staff and frankly we issued a fulsome apology that was rejected by them. But they should be issuing us with an apology.
"I would say that if her name were not Thatcher we wouldn't be talking."
Thatcher, who won I'm A Celebrity... in 2005, has only been banned from The One Show and not the BBC as a whole.