The monarch also reportedly walked her two Corgi puppies, which arrived at Windsor Castle in February when the Duke of Edinburgh was in hospital. Philip died peacefully in his sleep at Windsor Castle on Friday, two months before his 100th birthday.
The Queen, who has a deep Christian faith, attended a private church service within Windsor Castle on Sunday where she said private prayers for Philip.
The monarch is understood not to have attended the worship in the private chapel, where the Duke's coffin remains at rest, draped in his personal standard and adorned with a wreath of flowers.
The mass was also not in St George's Chapel, which is currently closed and is where the funeral will take place on Saturday.
Her Majesty also reportedly walked her two puppies, Muick and Fergus, in the castle's grounds on Sunday afternoon.Insurance Loans Mortgage Attorney Credit Lawyer
The Queen spent her first Sunday without Philip attending a church service and walking her puppies (Image: GETTY)
A source told the Sun: "The Queen is the epitome of keeping calm and carrying on and went about her usual Sunday habits."
The monarch did not join Prince Andrew, Prince Edward, Sophie and Lady Louise Windsor for the Sunday service at Royal Chapel of All Saints at Royal Lodge.
The Duke of York said afterwards: "The Queen, as you would expect, is an incredibly stoic person.
"She described it as having left a huge void in her life but we, the family, the ones that are close, are rallying