Beard's daughter claimed the show was deliberately edited to imply that Diana had removed rival Iain Watters’ Baked Alaska from the freezer, which led to his disqualification after throwing the dessert in the bin.
Sarah, Diana’s daughter, said her mother has been “done up like a Christmas turkey” by the show.
“She has been sacrificed on the altar of ratings. To exploit an old lady is shameful,” she told The Sunday Mirror.
The ‘bingate’ incident sparked wide online abuse and criticism of the 69-year-old, who was nicknamed 'Dirty Diana'.
The worst Bake Off gaffes
The worst Bake Off gaffes
1/7 GBBO gaffes
It sounds impossible, but the great meltdown of series five involving Iain, Diana, and the hottest day of 2014 so far was more controversial than Custardgate. It ended when Iain binned the remains of his Baked Alaska and stormed out of the tent
2/7 GBBO gaffes
The bread basket challenge in series two had many bakers scratching their heads. Worst off was poor Janet, whose basket collapsed as soon as she took it out of the oven
3/7 GBBO gaffes
Who can forget the most unpatriotic British flag cake ever made in series four? Not only did you have to cut Liz's head off to see inside: the flag itself was more than a little wonky
4/7 GBBO gaffes
It's not even clear what this biscuit bake was supposed to look like, but series one contestant Louise said it was supposed to be heart-shaped. It's definitely not
5/7 GBBO gaffes
More of a camera gaff than a baking one: this squirrel made headlines for all the wrong reasons in series two when it found itself on national television. Complaints were made over the fact that the image failed to come with a "may contain nuts" warning
6/7 GBBO gaffes
Poor Yasmin in series two had a mini breakdown when her macarons failed to rise. Everyone else was more concerned about the dodgy shade of green. 'I didn't realise I'd get this emotional with baking,' said Yasmin. None of us did, Yasmin. None of us did
7/7 GBBO gaffes
The curse of the soggy bottom struck one unlucky contestant in the form of this zingy tart from series three. Mary Berry pursed her lips over how much lime zest had been used, while Paul Hollywood just looked disappointed at the poor quality of pastry on offer
Last year’s finalist Ruby Tandoh defended the pensioner, tweeting: “Shame on the online lynch mobs and on the show’s editors for letting her Bake Off dreams end in a witch-hunt.”
The Baked Alaska incident has since received over 800 complaints to the BBC and Ofcom.
Video: 'Bingate' - Great British Bake Off
But the BBC has failed to apologise to Diana, who has since left the show due to ill health after losing her sense of smell and taste.
A spokesman said: “She hasn’t asked for or needed one. We don’t feel that she’s been misrepresented.”
Iain and Diana said they have been in touch since the incident was filmed earlier this summer, and remain on good terms.
The two contestants will be reunited in the series finale in October.