"Plans to mark the day with a new portrait of her are set to be shelved because she is still in the official period of royal mourning for her beloved husband," royal expert Rebecca English shared.
"The glaring absence of Prince Philip will be impossible to ignore and the run-up to what should have been a joyous day is set to be overshadowed by speculation about the major rift in her family."
However, it's been reported that members of the royal family will visit the Queen this week so she has some company.
The Queen's public birthday celebrations are toned down as well due to the ongoing COVID-19 pandemic. Trooping the Colour — a ceremony performed by regiments of the British and Commonwealth armies in June to mark the Queen's birthday — was canceled for the second year in a row.
Prince Edward's wife, Sophie, Countees of Wessex, said the Queen "has been amazing" following Philip's death, and it seems like she is trying to keep busy during this trying time.
"Her family will step up and be by her side, but she will carry on," a former royal aide revealed. "She understands that she has a job to do, and [Philip] would have wanted her to crack on. She did do so when he retired from public life."