The royal threw herself into her working role shortly after leaving school.
While performing her royal duties, body language expert Judi James claimed she had a “tough” demeanour.
She said: “Anne’s facial expressions often oozed the notion that she would never suffer fools or even weaklings gladly.
“She looked (and still does) like the kind of tough countrywoman who was a stranger to self-pity or emotional displays.
“As a result, she could come across as a rather daunting presence.”
Her attitude to her royal role may be similar to that of her father, Prince Phillip, 99.
Judi added: “Photos of her taken with her father years ago show physical closeness, ease and mirroring.”
Princess Anne has regularly carried out duties on behalf of the Queen and is often considered one of the hardest working royals.
When making official outings, Judi explained the royal has taken a unique approach to her role.
She said: ” Anne was only really a rebel insofar as that she didn’t fit into the traditional role of a royal princess of the day.
“She was a sportswoman and she was opinionated in an era when she was probably expected to sit around in palaces waiting for her prince to come.
“Anne might have sat still for long enough to pose for some more formal and romantic ‘princess’ style portraits but in real life she was more often seen with her hands on her hips and a determined frown on her face, getting on with jobs like stoking the BBQ or mucking out the horses.”
Princess Anne’s approach also shows her key difference to her brother Prince Charles, Judi suggested.
She added: “Growing up he and Anne perfectly defined the chalk-and-cheese sibling relationship, with Charles suffering through his school years while Anne just got on with things.
“Anne’s body language signals with her brother Charles suggested – almost from birth – that she was the one who had been gifted all the confidence.
“While Charles looked dreamy, shy and hesitant Anne looked bubbling with happy self-esteem.”