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The actress - who starred in the first two seasons portraying The Queen from 1947 up until the mid-1960s - took a step back as Oscar winner Colman took the mantle to tell the next chapter of her story.
But she's now back filming flashback scenes for season four.
While Netflix is keeping a tight lid on details of the next season, her involvement was leaked after Foy was spotted filming dressed as The Queen.
For the scenes, Foy donned a classy white dress and pearl necklace similar to those The Queen wore while giving a radio broadcast from South Africa on her 21st birthday in 1947.
It is not yet known whether any other stars from her generation of The Crown, like Matt Smith, who played Prince Phillip, will return in a similar vein.
Season 4 of The Crown will focus on Queen Elizabeth's reign during Margaret Thatcher's controversial spell as Prime Minister.
Thatcher will be played by Gillian Anderson (from The Fall and Sex Education).
Gillian Anderson will play Margaret Thatcher in The Crown Season Four, now in production. pic.twitter.com/OVCO8o2bVk
- The Crown (@TheCrownNetflix) September 7, 2019
Meanwhile all of the primary cast from season three, including Colman and Tobias Menzies (Prince Philip), Helena Bonham-Carter (Princess Margaret), Josh O'Connor (Prince Charles), Ben Daniels (Antony Armstrong-Jones), Emerald Fennell (Camilla Parker-Bowles), Erin Doherty (Princess Anne) and Marion Bailey (Queen Mother) will be returning.
Princess Diana will also make her first appearance, played by Emma Corrin (from Pennyworth and Misbehaviour), and the series is expected to portray her wedding to Prince Charles and their relationship afterwards.
It will likely also touch on their 1983 tour of Australia followed by the births of their two sons, Prince William and Prince Harry.
Camilla is still included in the cast, so we imagine the show will delve into their affair, too.
Plus, it is expected to focus on a lot of other goings on, from the time shots (fortunately blank) were fired at The Queen at the 1981 Trooping the Colour ceremony, to the Falklands War, and, of course, Princess Anne's marriage to Mark Phillips.
The Crown season 4 is expected to land in late 2020, and has already started filming.
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