That is, to murder her. From "Militants Threaten to Kill Journalist," from [1] AP, with thanks to Jeffrey Imm:

BAGHDAD, Iraq (AP) -- Islamic militants have threatened to kill an Italian journalist abducted in Iraq by Monday unless Italy agrees to withdraw its troops, according to a statement on the Internet.

The statement, which appeared Saturday on an Internet bulletin board that serves as a clearinghouse for messages from extremist groups, said Giuliana Sgrena, 56, would be subjected to the "rule of God," a phrase that usually means punishment by death in the lexicon of Islamic militant groups.

There was no way to verify the authenticity of the statement.

"We in the Jihad organization in the land of the two rivers announce that the rule of God will be carried out on the Italian hostage after 48 hours if the Italian government headed by (Italian Prime Minister Silvio) Berlusconi the criminal does not announce Italy's withdrawal from Iraq."