Queen Elizabeth II no longer has her closest adviser, Prince Philip, by her side.

But a royal expert believes that, if he were still here today, the Queen's late husband would have important advice following her health scare this week. She spent a night in hospital after cancelling a trip to Northern Ireland.

Prince Philip would urge The Queen to slow down: Expert

Royal expert Angela Levin says Prince Philip would tell the Queen to "relax a bit" after she was hospitalized and told to "rest." Observers fear the Queen is too devoted to work and not to her health now at age 95.

Queen Elizabeth II is "very sad" that Archie won't be coming to the UK.

Please watch the video above for more on Prince Philip's likely advice for the Queen if he were here during her new health concerns.