Sources say the Monarch has made the "very thoughtful gesture" towards Ragland because she respects her so much. In light of all the pre-wedding drama caused by Meghan Markle's father, Doria was poised, collected, and there for Meghan (as the mother of the bride should be).
The Duchess of Cambridge's family has joined the royals at church on Christmas morning but they have stayed at nearby Anmer Hall rather than Sandringham itself.
The invitation would would break with royal precedent.
China's Xi Jinping vows lower tariffs, more imports at trade fair
The two leaders discussed how to strengthen trade and investment ties between Kenya and China. Companies in attendance include General Motors, Ford, Microsoft, Samsung, Walmart and Tesla.
Meghan's mother has already been seen taking part in nanny classes at a USA parenting centre and is keen to be hands-on with her first grandchild.
Meghan - who is thought to be around four months pregnant - wore the striking outfit during a walkabout in Rotorua on her last day in New Zealand with her husband.
It looks like the Royal Family will be adding a seat to their Christmas table this holiday season. Instead, the royals give silly gifts - one year, Middleton reportedly even gave Harry a plastic Grow Your Own Girlfriend kit.
On Christmas Day, the family attends Christmas services at St. Mary Magdalene church, which are followed by a Christmas Day meal featuring a Norfolk turkey as the main attraction.