Sonette was educated in South Africa and completed her education at the University of Pretoria. She spent the first ten years of her teaching career working in Africa in a variety of schools. After immigrating to England in 1993, Sonette initially worked as an English teacher in Kent. She accepted a promotion as Head of English to Chatham Grammar School for Boys in 1997 where she remained until 2000.
In September 2000 Sonette moved to The Cornwallis School in Maidstone where she remained till 2008. In her time at Cornwallis she was Head of English, Assistant Headteacher and Head of School.
Sonette is a Trustee at CXK, a member of the Supervisory Directorate of the KMPF (Kent and Medway Progression Forum) and is a founding member of the Ashford Teaching Alliance where she leads on Initial Teacher Training. She also serves on the Senior Operational Group for the Pixl Organisation, an educational organisation interested in raising outcomes for all.