[1] She became involved in Breton nationalism through the clandestine group Gwenn ha du, which planned to blow up a monument in Rennes commemorating the Union of Brittany and France.
During World War II she was associated with the collaborationism of other Breton nationalists, working with Roparz Hemon in his Breton-language broadcasts from Radio Rennes Bretagne.
She fled from Rennes in the Bezen Perrot convoy in July 1944 and lay low with Jean-Marie Chanteau in Paris before fleeing to Ireland.
When a shocked local learns that she was a member of a militant separatist group allied to the Nazis, Meavenn denies that it was ever involved in violence against people.
It inspired the filmmaker Yves Allégret for his film La jeune folle ("The crazy young", but released in English as Desperate Decision), but its endearing poetry in Breton was not adequately replicated.