But the big shift in her favour began last night when John McDonnell tried to get her to drop out of the race. He had 16 nominations and was heading towards 20.
Despite the media reaction to his joke about Margaret Thatcher, he had gone down a storm at the GMB conference. David Miliband turned to him after the hustings and said "You've won this." By contrast, Ms Abbott was asked about her second job for the BBC's This Week (she promised to in future do it for free).
Last night, McDonnell tried to get a meeting with Ms Abbott but couldn't. In the end, she met McDonnell numbers man Mike Wood and explained that she had no intention of pulling out. At that stage, she still only had 11 MPs, so it took some balls. The early decision of Harriet Harman to break with convention and intervene in the race, giving her own nomination, had raised the stakes significantly.