At the time of her conviction in 2009, she was a member of the Chamber of Deputies of Rwanda, the country's lower house of parliament.
That year, she fled from advancing troops of the Rwandan Patriotic Front (FPR) and moved to a suburb of Kigali.
Nirere admitted to having handed out uniforms and other supplies to Interahamwe members, but she denied being otherwise affiliated with them.
Following a further five months as a member of parliament, she was charged with genocide and tried in a gacaca court in Giporoso, Gasabo District.
The speaker of the house, Rose Mukantabana, raised the issue since a maximum of ten days is allowed by the parliamentary law.