[2][3] Her mother was the sole daughter of railroad magnate and diplomat Col. James W. Quiggle of Philadelphia and Lock Haven, Pennsylvania.

[6] Blanche served for a time as the associate editor of The International,[7] a magazine founded by her close friend George Sylvester Viereck, whose sensual, decadent verse mirrored Wagstaff's.

[10][11][12] H. L. Mencken praised Wagstaff's poetic drama Alcestis for its "constant novelty and ingenuity of epithet", though he thought at times she let "her adjectives run riot".

[13] In 1907, she married Alfred Wagstaff III (1881–1930), the eldest son of Alfred Wagstaff Jr.[14] Before their divorce in 1920, they were the parents of:[15] After their divorce, she married well known real estate broker and amateur golf player Donald Carr on July 30, 1921, at Bide-a-Wee, her country place in Manchester, Vermont.

[6] In 1934, she sold two business buildings, 24 and 26 East 54th Street, adjoining the southwest corner of Madison Avenue, in midtown Manhattan for $400,000.