She now divides her time between the emergency department at Palmerston North Hospital and the health clinic at Linton Army Camp.
"Although we're both nurses, we have quite a different focus within nursing," said Mrs Thornton.
The pair come from a nursing family. Mrs Thornton's mother - now 82 and present at her daughter's and granddaughter's graduation - was a surgical nurse for many years.
Mrs Thornton's aunt was also a nurse, and her younger daughter is a veterinary nurse.
Mrs Thornton said she was delighted to be able to graduate with her daughter, although the pair had not planned to graduate together. "It was very special," she said.
Ms Ratcliffe, who went to Whanganui High School, said while she and her mother were never in the same classes during their studies, there were perks to studying the same degree.
"For example I had just done a pharmacology paper, and then she took it the semester afterwards, so just being able to discuss it was helpful."