The 69-year-old Women's Institute member quit the show after losing her sense of smell and taste the night before episode five was filmed.
The BBC said Diana's exit this was "not connected in any way" to the Baked Alaska scandal of episode four that viewers witnessed last night.
Diana, who is the oldest contestant to ever take part in the series, was attacked on social media after she took fellow contestant Iain Watters' ice-cream out of the freezer during the all-important final task.
Iain became enraged when his dessert was left runny and stormed out, only to return and present his creation in the bin. The 'bingate' hashtag was born and it was announced that Iain would be leaving the competition.
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
Despite the dramatic events of the latest instalment, the Bake Off was shot last spring, meaning that recent controversy would not have affected Diana's decision to leave.
Nevertheless, the BBC received 556 complaints from viewers arguing that Diana should have left instead of Iain.
Earlier today, Diana broke down in an interview and claimed she had been "stitched up" and made a scapegoat by the show's editor.
"Why would I want to sabotage Iain's Baked Alaska?" she told the BBC. "Iain does not hold me responsible for his failed ice cream. He rang me three days ago to warn me that the knives were out."
The BBC also rushed to Diana's defence, insisting that the offending ice-cream removal lasted "less than a minute" and was "in no way responsible for Iain's departure".
Iain's Alaska was out of the freezer for 40 secs. That's it. No sabotage. 40 secs of normal temp would NOT be enough to reduce it to liquid— Sue Perkins (@sueperkins) August 27, 2014
At the end of the day Mary & I need something to judge, it's not about melted ice cream but about what's presented to US... #bingate— Paul Hollywood (@PaulHollywood) August 27, 2014
Paul Hollywood also took to Twitter to put an end to the drama, tweeting '#enoughnow' and adding that his fellow judge Mary Berry would be "upset" at all the debate.