Sonia Artinian, the group's HR director from September 2013 to July 2015, was not charged, however, with financing a terrorist organisation after being summoned last month by investigating judges in Paris.
The choice to cling on in Syria after other international firms fled the fighting has dragged Lafarge, a French company which merged with Swiss firm Holcim in 2015, into a spiral of scandal and recriminations that has embroiled the French state.
Judges are investigating allegations Lafarge funnelled some 13 million euros to armed fighters including Isis group jihadists to keep the factory working.
Following interviews, Artinian was indicted for "deliberately endangering the lives of others", but granted "assisted witness" status on the terrorism financing charge.
Her lawyer, Benjamin Grundler, told AFP: "This decision confirms that my client is totally unaware of the alleged facts of financing of a terrorist organisation."
Six former or current top Lafarge executives have been charged with financing a terrorist organisation.
Those bosses could also face prosecution for endangering the lives of their local Syrian employees after 11 of them filed their own lawsuit alleging Lafarge put the prospect of profits from rebuilding Syria after the war ahead of their safety.
In 2013, Syrian mechanic Yassin Ismail, employed at Lafarge's plant at Jalabiya since 2009, was detained by jihadist fighters from a group that would later change its name to the Islamic State.
After several months in captivity Ismail was executed, according to relatives and three former colleagues who spoke to AFP in the northern Syrian town of Ain Issa.
Another mechanic Abdul al-Homada, 35, was kidnapped in 2013 in the city of Aleppo — and later very likely killed — after heading there to pick up his salary, four of his former colleagues told AFP.