They're perhaps padding out the resume like they do with the others. Mary's experience as an account executive (sales person with charge card) was deemed sufficiently unpalatable that her gonad flashing dad's career had to be dropped in to beef up her credentials.
I'm guessing the job was perhaps not overly impressive. If it was, they would be singing it loud and proud. It would be up there with the violin.
Padding out resumes is done quite often in the the Danish royal family. They did it first when Alex married Joachim. They stated that Alex has studied at all these institutions. Yet, Alex didn't complete anything. And dosen't have a qualification beyond high school. They also went flashing out her Dad's career.
I find it strange that there is so much mystery about Step education and work history. Maybe, she is not as educated as I thought she was.