Royal author Tom Quinn told viewers: “Anne was probably the only senior royal who, right from the start, was very wary of Sarah.
“She called her ‘the outsider’.
“One of the problems for Anne was that she was outranked by Sarah.
“Officially, at least, according to protocol, she should have curtsied to Sarah.”
He added: “And that was never going to happen.”
Mr Quinn also pointed to Prince Charles’ changing opinion of his brother’s wife.
The author claimed that the Prince of Wales had at first welcomed the “sparkle” that Fergie brought to the monarchy.
But eventually, her behaviour grated on him and gave some family members “a headache”.
According to Mr Quinn, Prince Charles once quipped: “The problem with Sarah is you just can’t shut her up.
“She could be fun some of the time, just not all of the time.”
PR expert Farzana Baduel gave further insight into Fergie’s relationships with the royals.
She told Channel 5: “Whenever you marry, you also marry the family to a certain extent.
“But when you marry into the royal household, it’s a completely different level.
“All of a sudden, you’re not only marrying into the in-laws, but also all of the advisers, the people working at the Palace.
“It’s like a huge corporate structure. There are different factions, different agendas.
“You have to be pretty sophisticated in order to manoeuvre yourself throughout.”
Source: EXPRESS CO UK