Yeshi Girma, 32, was so upset by the sentence Thursday that she had to be assisted out of the courtroom, The Times of London reported.
Girma's husband, Hussein Osman, is serving a life sentence for his part in the plot and has been told he won't be eligible for parole for 40 years. Osman and his colleagues tried to duplicate the deadly London Transport bombings of July 7, 2005, three weeks later. But their bombs failed to detonate because the explosives had not been mixed correctly.
During Girma's trial, jurors heard evidence that she and her brother, Esayas Girma, drove him to Brighton where her sister, Mulu, provided medical care. The brother and sister were sentenced to 10 years in prison and Mulu's former boyfriend to nine, The Times said.
Judge Paul Worsley called the sentences "woefully inadequate." He said that the Girmas helped kill Jean Charles de Menezes, a Brazilian immigrant mistakenly shot by police during the hunt for the bombers, The Times report said.