No, not at all. I have been living in France for over 20 years. Among my French friends, some leave nothing extra ever, but the majority will leave a few euros if the service was good and they will probably go back (or if they have been overly demanding).
For your daughter, if the waiter takes good care of her/her group and tries to accommodate in English (or deals well with special requests), an additional 1 or 2 euros per head would be sufficient. It's hard to define, but it's certainly not a percentage like in the US. For example, we were out for dinner tonight and the staff were very attentive and handled a special request well (it's snowing *unusual* so things were slow). We left 4 euros on a 120 bill, because 5 felt like too much, but we are planning on going back. If we had left nothing extra, there would not be any feeling that we were unhappy at all.