Trabelsi was born in Rabat and went to secondary school in Morocco and then she emigrated to France. After her graduation in France (troisième cycle) she returned to Morocco for some time. She now holds a Doctorate degree in economic studies from the University of Aix en Provence. She is the author of the successful novel "Une femme simplement" (1995). "Une Vie à trois" is her second novel. Bahaa has worked in a government job and is now a journalist and head of the Moroccan magazine "Masculin" and prominent member of an association fighting Aids.
Her third novel is "Slim".