My wife is going to rent a car in Switzerland and will be driving through France. She is a French citizen and has a French license, but she has a green card and a US license also. She is residing primarily in the US and will be going back to visit, if that matters.
Some rental companies offer different rates for "foreign" (i.e. US-based drivers) when in Europe compared to European drivers. Are there any problems renting a car with the US license instead of the French license? Are there laws about which license has to be carried/offered when multiple are available?