She was the president of the Fédération nationale des producteurs de légumes (English: National Federation of Vegetable Producers) from 2001 to 2012, and a member of the board of directors of the Fédération nationale des syndicats d'exploitants agricoles (English: National Federation of Agricultural Holders' Unions).
She started her agricultural career in 1989, running a family vegetable farm with her husband Thierry in Saint-Martin-le-Beau, Touraine.
In 1991, she joined the board of directors of the Fédération nationale des producteurs de légumes (FNPL) (English: National Federation of Vegetable Producers), a branch of the Fédération nationale des syndicats d'exploitants agricoles (FNSEA) (English: National Federation of Agricultural Holders' Unions).
[2][3] Delahaye entered politics in 2010, supported by Hervé Novelli, with whom she had previously worked when he was Secretary of State for Trade.
[1][2] In May 2014, Delahaye was elected to the European Parliament, with the support of Bruno Le Maire and Jean-François Copé who campaigned for Brice Hortefeux to make her his running mate.