The Secret Garden is a children's book by Frances Burnett. Mary and Colin are happy when Susan Sowerby visits because she is warm, treats them like her own children, and brings new books.
Susan Sowerby is the mother of Dickon and Martha who is represented as the symbol of motherhood and a warm personality. She loved Colin and Mary and treated them the same as her children.
The children felt as happy in her presence as she radiates warm energy and supported children. Whenever she visits children she carries new books with her that made them joyful.
Therefore, Susan Sowerby was warm and treated children like her own.
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