She referred in the interview to a "George V or George VI convention" that would mean her son Archie would become a prince "when Harry's dad becomes king".
But she went on to say that she had been told when she was pregnant that "they want to change the convention for Archie" so he would not become a prince.
"I saw that Meghan mentioned that there were plans to narrow eligibility and I imagine that this is a reference to the Prince of Wales's stated view that the size of the royal family needs to be reduced," said Bob Morris from the Constitution Unit at UCL.