It is widely believed that Gabrielsson has Larsson's laptop and the beginnings of a fourth book in the "Millennium" series, but she has been vague about her intentions.
Until now, public sympathy in her native Sweden has largely been for Gabrielsson, but the vitriolic autobiography might change that, some say.
"The book is a vengeful memoir filled with Lisbeth Salander-like score-setting," said Kurdo Baksi, author of "
He said reaction to the book has been largely negative and that the book does little to shed light on either Larsson or his works.
"Journalists described the book as a biography of Eva Gabrielsson, not about Stieg and 'Millennium,' Lisbeth Salander or Mikael Blomkvist," Baksi said.
Blomkvist is a character in the books.
"Eva Gabrielsson is not as respected now as before she published the book," Blomkvist said.
"I am very sorry for her, and I regret that the book does not give more information to the readers."
In one revenge-stoked scene in the memoir, Gabrielsson carried out a pagan ritual with a torch and a goat's head on a spike, reciting a poem to the Norse gods and cursing all those who wronged Larsson.
She even spoke to a crow that she was convinced was sent from the heavens as the reincarnation of her longtime lover.
At one point, Erland and Joakim Larsson suggested that Gabrielsson was "deranged and demented."
But she has remained steadfast in her opposition to the family.
"The 'Millennium' books were synonymous with misfortune for Eva, she didn't want to talk about them and didn't even read them when they came out," said Marie-Francoise Colombani, the French journalist who collaborated with Gabrielson on her book, which was dictated in Swedish, communicated in English, then written in French and later translated into Norwegian.
Seven Stories Press has acquired the North American rights.
But Barry Forshaw, author of the 2010 Larsson biography, "The Man Who Left Too Soon," said Gabrielsson has cleverly positioned herself in the debate.
"Unquestionably, this narrative does no harm for her to be seen this way for her campaign to raise money for the fight against his family," Forshaw said. "Actually, she is rather good at playing the media game rather well."
Now, the English-speaking world has largely taken her side in the dispute, Forshaw noted. "The general feeling is that she definitely was maligned and is the victim in this," she said.
"Although, there is a reaction against the feeling that she is Lisbeth Salander or a victim on that scale," he said. "But the sympathy is very much with her. I speak to Americans and Brits all the time, and generally speaking, they are hardened against the family.
"Millennium, Stieg and Me" chronicles how the couple met in 1972 at the age of 18, and their struggles together at Expo, the anti-fascist publication Larsson founded in 1995.
Larsson and his staff "moved around constantly to escape the Nazis who were harassing them," Gabrielsson wrote.
If they had married, she said, their addresses would have been made public.
She wrote in the book that her longtime lover's image has been exploited: "I don't want to see coffee mugs and other 'Millennium' merchandise; I want to see the 'real' Stieg respected."
Interest in the trilogy -- and its cash profits -- has continued with the upcoming U.S. version of the film,