She completed her PhD on "late pregnancy complications in women of advanced maternal age" in 2016. Part of her PhD involved the design, securing of funding and successful implementation of the 35/39 trial; a national multi-centre prospective randomised controlled trial of induction of labour versus expectant management for nulliparous women over 35 years of age published in the New England Journal of Medicine in 2016. The rationale for this trial is that women of advanced maternal age have an increased risk of antepartum stillbirth at term and that induction of labour at 39 weeks might forestall some of the risk. However women of advanced maternal age are already at high risk of obstetric intervention, the trial provided evidence for whether induction of labour has any adverse effect on mothers or babies.