She continued her education at Rutgers University, completing a MS and PhD while working under the supervision of Carolyn Rovee-Collier.

[8][10] Hayne is a leading researcher in memory development in infants, children, adolescents and adults and her work has been cited in legal proceedings both nationally and internationally.

In 2017, she was accused of intimidating behaviour surrounding cuts to 16 full-time equivalent jobs in the division, and in 2018 following the decision to eliminate the entire Art History program.

[20] In the 2009 New Year Honours, she was appointed an Officer of the New Zealand Order of Merit for services to scientific and medical research.

[23] In the 2022 New Year Honours, Hayne was promoted to Companion of the New Zealand Order of Merit, for services to health and wellbeing.