She had not wanted a little girl at all, and when Mary was born she handed her over to the care of an Ayah, who was made to understand that if she wished to please the Mem Sahib she must keep the child out of sight as much as possible.
Frances Burnett. The Secret Garden (1911)
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"Come on," said Wilson. "The Memsahib can stay here in the car. We'll go to have a look at the blood spoor."
Ernest Hemingway. The Short Happy Life of Francis Macomber
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An indignant mem sahib in Majorca recounted the tale [...].
Agatha Christie. And Then There Were None. p.197 (1939)