Sidiga worked as a Professor of Family and Consumer Sciences/Community Nutrition and Professor of the Nutrition Center for Training and Research at Ahfad University for Women in Sudan, where she also formerly served as Dean of the School of Family/Health Sciences. She had contribution in population, reproductive health and nutrition, Dr. Washi published over 20 journal articles, a book on therapeutic nutrition, and many other influential academic works. Participated and presented on papers on international conferences on women rights.