Lizzie said she reached out to Meghan when she started dating Harry but Meghan was coy on details.
She said: “I was literally ghosted by her.”
Lady Colin Campbell - author of several books about the British Royal Family - claims that the late Princess Diana would've been "appalled" at the Duke and Duchess of Sussex.
In a statement to Woman magazine, the 69-year-old said Meghan and Harry were quick to "trot out the charm when it suits them" but are "otherwise graceless."
The Jamaican-born socialite said Meghan's behaviour showed a "lack of understanding and appreciation" of her royal position.
"I'm not sure who she thinks she is behaving this way," Lady Colin said.
The royal biographer believes the Sussexes are "depriving" royal fans by being "pretentious."
WATCH: Meghan hits the polo with baby Archie