This Wallpaper: Oui Or Non?

I’m working in a hardware store in Germany. A lady approaches me and speaks with a French accent.

French Lady: “Excuse me. Could I ask you something?”

Me: “Yes, how can I help you?”

French Lady: “I was wondering if I could also use this wallpaper here to paper a French room?”

Me: “Excuse me, but what is a French room?”

French Lady: “Well, a room in France!”

She’s looking at me like I am the dumba** here.

I go silent for a second. I think about telling her that this wallpaper is a German one, so it is only applicable in Germany, but I discard this idea.

Me: “Yes, you can use it.” *Quickly walks away*