One report said Ms Madani continued to shout her allegiance to the terrorist group as an ambulance took her to hospital.
French policemen took part in a raid in Boussy-Saint-Antoine, a suburb south of Paris, on Thursday.
Speaking on the sidelines of Mediterranean states summit in Athens, French President Francois Hollande said "a terrorist attack has been thwarted". "Information we were able to get from our intelligence services allowed us to act before it was too late".
One of the women stabbed a police officer during the arrests, before she was shot and wounded.
The father of the terror cell's ringleader, a 19-year-old woman named Ines Madani, flagged her to authorities, Molins said. French police detained three women planning "imminent and violent action" after a standoff Thursday linked to a terrorism investigation into six gas canisters found in a auto abandoned near Paris' Notre Dame Cathedral.
Molins told reporters that investigators found traces of diesel fuel on a blanket and a cigarette in the trunk. No detonators were found.
Yesterday three women were arrested in France for planning an imminent terror attack.
She had sworn allegiance to IS in a letter found in her handbag.
The two women being sought are the daughters of the car's owner - who was also known to authorities for spreading Islamist ideas.
Sarah H., 23, had been engaged to Larossi Abballa, whom authorities said killed a police officer and his girlfriend at their home in June before turning his gun on himself, according to Molins.
Police shot and wounded Ines M., who was the driver of the abandoned vehicle.
Teams of police then swooped on the women and in the struggle, the 19-year-old Ines Madani was shot in the thigh and the ankle. Officers found her father's auto loaded with gas canisters Sunday by the famous church, according to investigators. Mr Molins said she had tried several times to travel to Syria.
More than one-third of the almost 700 French citizens who have reached the war zones of Iraq and Syria are women, according to government figures. Other officials said it was the teenager who attacked the officer.
Security in train stations around Paris was visibly higher Friday as the investigation into the vehicle widened.
A bomb squad with dogs and a scanner was deployed when a gas canister with a timer but no detonator was found outside a police station Friday morning in the suburb town of La Plaine Saint Denis, just north of Paris, and one kilometer (a half-mile) from the Stade de France in Saint-Denis, a local police official said.
As well, the son of a gas delivery driver was detained briefly because he had canisters in his auto.
A controlled explosion of a motorcycle in Paris on Friday.
Explosive gas canisters filled with nails were the weapon used in bomb attacks by Algerian extremists on Paris in the 1990s. For the protection of AP and its licensors, content may not be copied, altered or redistributed in any form. Doing so may result in civil and/or criminal penalties.