"We needed to establish strict rules to stop them speaking in French, and bring an end to the Frenchification of the municipality," her spokesman said yesterday.
The measures come into force in January. Flash cards with pictures of telephones, @ symbols and identity cards will be used for French speakers, who are one-fifth of those visiting the town hall.
The proposals were labelled "a load of nonsense" by an opposition politician, Olivier De Boel.
"The lines at the town hall are already pretty long, and this new method of communication isn't going to make them any shorter."
But the Minister for Integration for the Flemish separatist party, the N-VA, said Dutch was not spoken in the French town of Lille just over the border, so there was no reason French should be spoken in Menen.
But the difference is that Belgium is a bilingual country. It has about 4.5 million French speakers mostly living in the southern province of Wallonia. They are outnumbered by 6.5 million Dutch-speakers living mostly in Flanders. Brussels is officially bilingual, although French is most commonly heard in the centre.
Separatist sentiment remains high in Flanders. The N-VA gained record support in 2010, leading to a crisis which left Belgium without a government for 541 days.
- Independent