The same fascist vicious people who supported the Dirty War has been after her from the first, even sending police into her house to search it, attacking her children, etc., etc. They have rained hell down upon her since her husband, the highly successful progressive president, Nestor Kirchner, who pulled Argentina out of a deep ditch dug by the previous US-supported President, died suddenly of a heart attack.
The assassination attempt only failed because the would-be assassin's gun, right in her face, jammed at the last moment. She is a brave, courageous woman, obviously NOT a greedy, treacherous human being, never has been.
They also hate her for not being blazing white, like them. They are graceless, soulless, eternal criminals, just like the ones we have here. They have wielded horrendous power, and they don't intend to let go.
On edit: I forgot to mention during the Dirty War, in the 1980's, they tortured, and murdered or disappeared 30,000 political "enemies." They tortured then chained selected prisoners together and threw them out of airplanes over the Atlantic Ocean, or large rivers, including some nuns who protested the kidnapping and torture of young citizens.
The government sent spies into dissent groups protesting the torture and murders to identify them in order to murder them, as well, including grandmothers, as in the group Mothers of the Plaza de Mayo (area outside the Presidential Palace, where they stood to protest) .

Cristina Fernández de Kirchner with Mothers of Plaza de Mayo