They are certainly not doing nothing. It could be said that they have not been doing enough. The response in France to that ambush was similar to the UK, including the cry that their forces were ill-equipped for the job. The French MoD's response, an order for just four or five American Buffalo MRAP vehicles plus uparmoured VABs as well as a consideration of possible leasing of further MRAP vehicles.
There is something like 600 French troops now deployed in eastern Afghanistan as part of Battle Group Kapisa that are more engaged in daily fighting alongside US and Afghan forces.
French MoD news piece over the weekend:
"From 14 March to Saturday morning, a battalion (Kandak) from the Afghan National Army has undertaken Alas valley in order to resume the land held by the insurgents. It is supported by over 400 French soldiers of the Battle Group Kapisa arms and large aircraft of the coalition (Predator drones, A10 and F15 fighters, helicopters Kiowa).
Rushed into their sanctuaries for the Afghan army, the insurgents have responded throughout the day. They have very likely been losses. The Afghan military deplore half a dozen wounded. During these clashes, a French soldier was slightly injured before being evacuated to hospital in Bagram.
The Franco-Afghan forces take the field. As night fell, an insurgent gets an anti-tank rocket in a French VAB. The driver, a corporal of the 27e Bataillon de Chasseurs Alpins was killed."
Around 3400 French soldiers are in Afghanistan, Tajikistan, Kyrgyzstan and Indian Ocean, in the context of the ISAF and Operation Enduring Freedom (OEF). Among them, 2800 French soldiers committed in the territory of Afghanistan. "