Her top-selling books included Lace and Superwoman.
Her death was confirmed by her fashion designer son Conran yesterday.
Jasper Writing on Instagram, he said: "Shirl girl has flown away, a lark ascending.
Messages
"Thank you to all the wonderful doctors and nurses and thank you to all of you kind, dear people who sent her so many beautiful messages that meant so much to her."
The London-born writer was educated at a finishing school in Switzerland, where she was interested in the worlds of art and fashion.
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