Meghan Markle has been accused of making a comment so rude in front of the Queen that her late Majesty had to “step in”. An ex-courtier alleged that ­during their time with her “there definitely were bad, very bad, even psycho moments.”

The unnamed source told The Sunday Times newspaper in a damning takedown of the former Suits actress: “I witnessed people being chewed up in person and over the phone and made to feel like s***.

“It was an incredibly fraught time and I’m inclined to give her the benefit of the doubt. She has said herself she was suicidal at times.” Reacting to the allegations, celebrated Royal Family historian Hugo Vickers told The Sun he “wasn’t surprised”.

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He said: “Well I’m afraid I’m not surprised by these allegations because even when she was at Windsor I remember hearing from very good sources that there was trouble.

“There was a time when she was very rude to one of the under gardeners at Windsor when they were at Frogmore Cottage. The head gardener went to complain to the Queen and she told her off because she obviously didn’t like people being rude to staff.

“None of these other stories surprised me. She probably is not very good with staff or people that she’s employing. It’s just very unattractive. You should always be very polite to people who work for you because otherwise they’re going to get very put out.”

Another source said the Duchess of Sussex, who is married to Prince Harry, with whom she shares two children in daughter Lilibet and son Archie, was a “classic narcissist”.

They added: “She is lovely when it is all going her way but a demon when the worm turns.” The royal expert continued: “I think quite a lot of actresses have a narcissistic side to them.

“Of course it can be very stressful leading up to a wedding. But once again this is when your true character comes out. We can all be very polite when things are going well. It’s when we’re under stress that that you see people getting annoyed and aggressive.

“She has shown quite a few narcissistic tendencies in the past particularly in things like the Oprah Winfrey interview.

“I think there was a lot of narcissism in that.”