April 22, 2015 at 12:00 PM EDT

Fans of The Royals know that very little intimidates Queen Helena (Elizabeth Hurley)—even a rebellious daughter, wayward husband, and conniving brother-in-law have proved no match for the sharp-tongued sovereign.

In fact, this season to date, no one has made the monarch break a sweat—unless you count her lover, Captain Alistair Lacey. But all of that changes when Queen Helena’s mother (Joan Collins) pays a visit to the palace.

“FML,” the queen says under her breath when she learns the Grand Duchess of Oxford has decided to stop by. And Helena has every reason to feel exasperated: Judging by this exclusive clip from the episode, the diamond-draped Duchess isn’t shy about sharing her opinion. “’I see you’ve redecorated. I’d love to know whatever possessed you to choose Vegas as your theme,” snarks Collins.

Check out what follows in this exclusive clip from this Sunday’s episode of The Royals, which promises to take a dramatic tone thanks in part to the 81-year-old Dynasty dame.

For more on The Royals, check out EW’s most recent recap of the E! scripted series. The Royals airs Sundays on E! at 10 pm ET.

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