The palace has, however, confirmed the bridesmaids and pageboys.
Asked whether she would be happy for Ms Markle to return to the school, Ms Diekmann said: "That would be great". This is a historic moment.
A day later Markle said he still wanted to walk his daughter down the aisle, but added that his health might not allow it.
Tracy Dooley, who was once married to Markle's half-brother, Thomas Markle Jr, flew into Heathrow on Monday with their two sons, Tyler, 25 - who reportedly works as a cannabis farmer in OR, where marijuana is legal and plans to create a hybrid called Markle's Sparkle - and Thomas, 26, a fast-food chain restaurant manager.
Kensington Palace's attempts to project a sense of serenity around the wedding preparations have been clouded by Markle's relatives, who have not been invited to Saturday's nuptials following stories of bust-ups, heavy drinking and an arrest.
Thousands of journalists from across the world are descending on the genteel town of Windsor for the wedding, and Thomas told TMZ that the media attention had taken its toll.
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One is Meghan's mother Doria Ragland, who was pictured leaving her Los Angeles home for the airport on Tuesday.
He joined Harry and Ms Markle in their VIP box at the Invictus Games in Toronto previous year.
"Whatever happens on the day, the events of the past week will leave a poisonous legacy", wrote Valentine Low, a royal reporter in The Times.
Meghan Markle, who is gearing up to marry Britain's Prince Harry, is advised by future Countess of Sandwich Julie Montagu to maintain her all-American roots in a new documentary. He suffered from a heart attack eight days ago and said that he might not be able to walk his daughter down the aisle.
Members of the armed forces - 250 of whom are expected to take part on Saturday - rehearsed the royal wedding carriage and military procession to iron out any last-minute snags.
Prior to his surgery, Thomas told the publication, "They [doctors] will go in and clear blockage, fix damage and put a stent where it is needed". She also reportedly told her father that she didn't care about the paparazzi photos.
Britain's Sun newspaper, the country's best selling, had to scramble to update its front page to reflect what it called the "Royal Sensation" of Thomas Markle's absence under the headline: "I've got heart op today".
We'll see what happens over the next few days.
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