Princess Maud had a son:
James Carnegie, 3rd Duke of Fife, was a second cousin of Queen Elizabeth II and Princess Margaret, Countess of Snowdon; he had two children of his own, Lady Alexandra Etherington and David Carnegie, 4th Duke of Fife.
David Charles Carnegie, 4th Duke of Fife, has three children:
Charles Carnegie, Earl of Southesk
Lord George Carnegie
Lord Hugh Carnegie
Lady Alexandra has one daughter.
The descendants of Maud are not official working royals. They are private citizens. And, yes, the Queen sees her cousins from time to time.