Diana qualified as a doctor in 1981 and trained in obstetrics and gynaecology, becoming a consultant at Guy’s and St Thomas's hospitals in 1996 with 
a particular interest in the ovulation problems of women affecting their fertility. Diana was the Clinical Director for Women’s Services for several years before becoming Deputy Medical Director and Acting Medical Director.
In 2014 Diana began supporting Medway Foundation Trust to improve their CQC rating, and helped lead it out of special measures in 2017. Diana also worked with colleagues across Kent and was chair of the Clinical and Professional Board for Kent and Medway.
In 2019 Diana became the lead for the developing Medway and Swale Integrated Care Partnership before retiring in January 2020.
During the COVID-19 pandemic Diana volunteered to support King’s College Hospital whilst also supporting the new Clinical Director for the ICP and Primary Care Networks in Medway and Swale.