Following the rape of two of her friends, she became a volunteer worker with SOS femmes battues violées in Strasbourg from 1975 to 1978.
[4] Lassègue began her professional life as a teacher in 1978 when she returned to Africa; she taught literature at the Lycée Français in Kinshasa.
[5] Lassègue entered politics in February 1991, when she was appointed as Minister of Information and Culture of the Republic of Haiti under the government of Jean-Bertrand Aristide and René Préval.
In October 1994, she returned to visit the grave of her father, who had died while in exile, and was about to leave again when she learned that she had been unanimously elected by the Senate to represent them on the Provisional Electoral Council.
[7][8] In 2012, she oversaw the Haitian parliament's ratification of a bill aimed at making fathers responsible for delinquency.