https://www.bbc.com/news/world-latin-america-46639187
Ms Fernández, 65, is accused of being at the centre of a massive corruption racket that allegedly saw millions of dollars in bribes paid by businessmen to government officials.
The allegations stem from a batch of records kept by Oscar Centeno, a driver for a public works official, between 2005 and 2015.
In the notebooks, Mr Centeno writes about delivering bags of cash from construction bosses to government officials, which prosecutors say totalled some $160m (£125m).
Mr Centeno’s notebooks include a reference to money exchanging hands at the home shared by Ms Fernández and her late husband, Néstor Kirchner, as well as the presidential residence and government headquarters. However, none of this has been proved.
More than a dozen people, including businessmen and former government officials, were arrested after the notebooks were handed to authorities by La Nación newspaper earlier this year. They are also due to stand trial.
Ms Fernández served as president for two consecutive terms, from 2007 to 2015, having succeeded her husband who was president from 2003 to 2007. He died in 2010.