Bentina is hired by Scrooge McDuck to be his maid, his nephews' nanny and mother figure, and as a housemaid and cook, asking only for room and board in Scrooge's mansion – an offer Scrooge could not refuse.
She also has a granddaughter named Webbigail, and is often seen cooking, cleaning or scolding the boys and trying to keep them from misbehaving, though deeply she cares for them very much.
She was a nanny of Prince Greydrake until Prince Greydrake's plane crash landed in the jungle of Africa 20 years ago. This happened after his evil uncle sent him on a plane ride to rid himself of his nephew. Greydrake becomes king at the coronation for his 25th birthday in the episode "Jungle Duck".
Bentina Beakley makes a reappearance in the reboot series as a major character. In this incarnation, Mrs. Beakley is portrayed as a stern British house-keeper who lives the mansion with her granddaughter, Webby. It was she who told Scrooge McDuck to spend more time with his family when they first met Huey, Dewey, and Louie. She was protective over Webby but allows her to go on adventures with Scrooge, Donald, Launchpad, and the nephews. She also helps Scrooge and the team on some of their adventures.
This version of Mrs. Beakley also serves as the show's version of Duckworth. This Mrs. Beakley has Duckworth's dry sarcastic wit, Duckworth's impressive physical feats, and Duckworth's position as Scrooge's personal assistant and butler.
In "Daytrip of Doom!", she jokes about being a spy. If true, this would explain a lot about her and Webby.