Kate Middletonis on the move.

The royal mom of three, who celebrated her 38th birthday last week, was spotted leaving her Kensington Palace home on Monday as husbandPrince Williamis inSandringham for an important family meetingto discussMeghan MarkleandPrince Harry‘s shocking decision tostep down from their senior roles. Kate looked serious behind the wheel on the rainy day, sporting a dark turtleneck under a tan coat while her hair was tied back, highlighting a pair of dangling earrings.

Kate’s outing comes as the royal family prepares to meet atQueen Elizabeth‘s country home of Sandringham, Norfolk, on Monday. The Queen has ordered Harry, his brotherPrince Williamand their fatherPrince Charlesto come together in a high-level meeting to “talk things through,” a source told PEOPLE.

The Prince of Wales will be traveling back from Oman to attend the summit. He arrived at the Middle Eastern country on Sunday morning to attend the “first of three days of official condolences” following the death of Sultan Qaboos bin Said al Said.

Kate Middleton.Ben Cawthra/Sipa via AP

CATHERINE DUCHESS OF CAMBRIDGE is seen leaving Kensington Palace in London

CATHERINE DUCHESS OF CAMBRIDGE is seen leaving Kensington Palace in London

The source recently told PEOPLE it is likely Meghan will participate in the discussion on Monday via phone, as she recently returned to Vancouver Island, Canada, where she and Harry spent the holidays together with their sonArchie.

The unprecedented family summit follows a series ofemergency discussions across the last few daysand raises the prospect that a solution is in sight that will work for the Sussexes and the royal family.

“There is a range of possibilities for the family to review which take into account the thinking the Sussexes outlined earlier in the week,” the source said.

“As we have said previously, making a change to the working life and role of the monarchy for the Duke and Duchess of Sussex requires complex and thoughtful discussions. Next steps will be agreed at the meeting,” the source shared. “The request for this to be resolved ‘at pace’ is still Her Majesty’s wish. The aim remains days not weeks. There is genuine agreement and understanding that any decision will take time to be implemented.”

DANIEL LEAL-OLIVAS/AFP via Getty

Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex arrive at Canada House on January 07, 2020 in London, England

The meeting will be the first time the Queen, Harry, William and Charles have all been together sinceRemembrance Day weekendin early November.

Prince William and Prince Harry.Karwai Tang/WireImage

Prince Harry, Duke of Sussex and Prince William, Duke of Cambridge

A palace insider toldTheMail on Sundaythat they have “never seen the monarchy in such a bad state.”

In fact, the 93-year-old monarch reportedly found out about thebombshell newsjust minutes before the public.

“Despite the traditional setting, the queen is understood to have read the announcement on an iPad before watching coverage as broadcasters revealed the shock announcement to the country,” the palace insider told the publication.

PA Images/Sipa

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source: people.com