The 95-year-old monarch travelled to Scotland on July 21 as part of her summer retreat but has not appeared at public events since travelling.
The Queen has faced episodic mobility issues since last autumn and now regularly uses a walking stick, with some of her official engagements this year shorter in length then would have been expected.
Royal expert Robert Jobson has said it would be “significant” if the Queen did not go to the Braemar Gathering on September 3.
Speaking to the Australian morning show Sunrise, Mr Jobson said: “I think it will be significant if she doesn’t attend.
“I understand she’s trying to work out ways to get in but the fact is that with the mobility she’s got, she’s struggling to stand on her feet.
“It’s difficult and also she’ll be in a position where you’re standing for quite some time.
“It’s quite awkward for her.
“I know she wants to go. We’ve seen all the developments lately which have led to all this speculation.”
The Queen missed much of her Platinum Jubilee celebrations during the extended Bank Holiday weekend in June but did make two separate brief appearances on the Buckingham Palace balcony.
She is also expected to break her summer holiday and travel back to England to hold audiences with the outgoing Prime Minister Boris Johnson and his successor in early September.
Despite health concerns, the Queen is unlikely to hand over the monarchy.
After becoming the longest-reigning British Monarch in 2015 as she surpassed the reign of her great-great-grandmother Victoria.
Royal expert Jonathan Sacerdoti has claimed the Queen is “unlikely” to have the crown over to Prince Charles.
Speaking to Express.co.uk, Mr Sacerdoti said: “I think it would be wrong of us to second guess that especially at the moment when the Queen is going through a period of rest.
“I also think that it’s unlikely that she would abdicate.
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She’ll be all right, she just needs another infusion of aborted baby cells!
What a greedy old grump. Just abdicate and let Charles have time to rule or die, but pick one. This is selfish, unnecessary and a joke.
You are a hateful despicable troll!
Even as a American I admire,honor and respect Queen Elizabeth.
Do you not know the Biblical significance of the Throne of England? Did no one ever inform you that it is the Biblical Throne of David? This Throne does not belong to the House of Windsor as they are only the titular heads: its rightful owner is Christ at His soon Second Coming. Prince Charles, along with other members of his family, do NOT qualify to sit upon this throne as they have been proven to be corrupt sell-outs to the infamous Satanic New World Order. Many believe the Queen realizes this fact and that is why she will stay on the Throne until God takes her away. She does this in honor of her Coronation Oath to be the defender of the Protestant Reformed Faith of the Realm.
That is ugly and hateful. A little compassion goes a very long way.
God Save Your Queen! I honor and respect a grand old lady who has done no harm to anyone I know. She has made family decisions but that is quite another matter and Charles is not Monarch material and the less time he serves, the better off the monarchy will be! His wokey son is probably not a lot better but he has a solid class wife to carry them til the next generation!