Note that the Swiss sockets are *not* compatible with the "Standard" Euro plug. The small two-pin French 5 Amp plugs fit Swiss sockets (and Euro sockets) but not vice-versa (Swiss plugs have a third pin - Earth) and the larger 15 Amp Euro plugs certainly do not fit Swiss sockets at all.
The good news is that "Wall-wart" type power supplies usually use the small French type plug so will work in France and Switzerland.
I lived in French-speaking Switzerland (Lausanne) for a time and found that electronic equipment was often sourced from France or Germany and could have either the small French or Swiss plug. The USB power supply can be bought from any of the big Swiss electronics shops like Fnac, Interdiscount or Steg.
Note also that French-Swiss keyboards are like a cross between German and French keyboards, (QWERTZ, not AZERTY or QWERTY, but with accents and cedillas) so again should be sourced locally, unless your grand-daughter is used to a French AZERTY keyboard.
1st Batch Model B (256M) running Raspbian, Pibrow case, with RaspiCam.
Model A (256M) running Raspbmc, caseless.