The food manufacturing boss was sent home by Lord Sugar after selling just £10 worth of second-hand items resourced by Team Sterling in this week's challenge.
McEvoy was brought back into the boardroom alongside Gabrielle Omar by project manager Laura Hogg after their 'Vintage Gold' shop in Brick Lane made £783.49 profit, less than the £1,063.40 taken by Phoenix.
> 'The Apprentice' review: 'You put masking tape on a window, well done'
As the team actually achieved higher sales than Phoenix, both Omar and Hogg were taken to task over Sterling's sizeable costings.
Omar was accused of ordering excess materials to create their "shabby chic" look, while her colleague was branded a "raving lunatic" by Sugar for allowing the £1,000 seed fund to be spent without any kind of strategy.
The Amstrad founder then asked McEvoy to justify her poor performance, to which the Irish businesswoman admitted that she was "quite a serious person" and "more comfortable in the business to business environment".
Although most of the team had deemed Omar responsible for the failure of the task, Sugar commended her enthusiasm and declared that the decision was between McEvoy and Hogg.
After telling the project manager that she "lost the plot and didn't run the team very well", he turned to McEvoy and said: "But I have a bigger concern with you Jane - you've been in the losing team three times in four weeks and nothing I have seen yet tells me that you are this great business person."
Speaking after her firing, a tearful McEvoy declared: "Lord Sugar mightn't have wanted me but I will be extremely successful in everything that I do and hopefully in a few years' time he'll look back and say 'I shouldn't have fired her'."
Phoenix were managed by fine wine investor Tom Gearing, who won his team a 1940s swing dance party with his frugal approach to the task.
> 'Apprentice' Duane Bryan: 'Don't look a gift horse in the eye' - video