The British actress became well known for playing the magical nanny's young charge in the 1964 Walt Disney musical film opposite Dame Julie Andrews and DICk Van Dyke.
However, Dotrice, now 58, admits she had never watched the movie all the way through until last week (ends17Nov13) when she was invited to a screening to mark the upcoming 50th anniversary of the film's release.
She says, "The amazing thing is I've never actually seen Mary Poppins all the way through until last week at this 50th anniversary premiere. And it's absolutely a corker... I took my kids. They've never seen the film either... They were proud and I think they were a little bit shocked, actually, because that was their mum. I think it was a bit discombobulating, but they loved the film."
Dotrice insists the reason she never saw the whole film was because she was forced to leave the 1964 premiere early as she had to go to school the next day.
She adds, "I was a little girl and I had to go to school the next morning. My parents were very good at keeping (my) feet on the ground. I think I got away with not doing homework that night, but I had to go back to school so I only stayed for about a half an hour... I was sitting in between Princess Margaret and Queen Elizabeth. I just couldn't believe I was looking at real jewellery and real royalty. I wasn't watching the film at all."