Dr Pienaar was born in Jan Kempdorp, Northern Cape South Africa. She completed her undergraduate studies at the University of the Freestate. She specialized in gynaecology at the University of Pretoria. Since finishing her studies she qualified herself further in minimal invasive surgery, infertility, obstetric ultrasound and menopause. She is a member of the South African Society of Obstetricians and Gynaecologists, South African Menopause Society and Southern African Society of Reproductive Medicine and Gynaecological Endoscopy.