Prince Philip will join her in Balmoral in two weeks.
Queen Elizabeth II and Prince Philip, Duke of Edinburgh attend The OUT-SOURCING Inc Royal Windsor Cup 2018 polo match at Guards Polo Club. Photo / Getty Images
The source added that if Prince Philip actually was ill the Queen would be at his side rather than at her Scottish estate.
The Queen spends her summer months at the private residence and is frequently joined by other members of The Royal Family.
Crathie Church lies next door to Balmoral and the Queen is a regular presence at services during her annual holiday.