The 34-year-old Duke and 37-year-old Duchess of Sussex's tour is set to take place from Tuesday, October 16th, until Wednesday, October 21st. She handed a letter to one of the guards in the hope they would pass it on.
Markle, who is Meghan's half-sister from their father's first marriage, has previously called the royal "cold" and fake.
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Samantha showed up to Kensington Palace uninvited earlier this month, and now a source tells ET how the Duchess of Sussex and the royal family are dealing with the situation.
Since her visit, Markle has posted a series of tweets about the trip to London, including a reference to her palace visit.
Samantha said that if she got the chance to speak to Meghan, she would tell her it's "water under the bridge" and recognize that their issues spiraled "out of control". Neither of them had attended the former actress' royal wedding to Prince Harry in May.
Grant said she was hurt that some in the family weren't invited to the wedding (their father, Thomas Markle was, though he couldn't make it because of health concerns). She added, "Moving forward, I apologize and I wish things could be different". "Dad only spoke out because he was being ignored and disregarded", she wrote in part to another Twitter user. "My sister and the Royals handled things wrong and everybody knows it".