[4][5] "Fresh as football weather and as up to date as Radio City, this story has a verve seldom found in the usual run of boarding-house stories," commented the New York Times reviewer Ellen Lewis Buell of McCormick's juvenile novel, Diana's Feathers (1935).

[6] Her fantasy and science fiction novels included The Devil's Spoon (1930), Murder Strikes an Atomic Unit (1946), Solution T-25 (1951) and Sarah Hall's Sea God (1952).

[7][8] Theodora McCormick also co-wrote a book, Amateur and Educational Dramatics (1917), with Evelyne Hilliard and Kate Oglebay.

[2][8] Theodora McCormick moved to Dongan Hills, Staten Island after marrying engineer Delafield Du Bois in 1918.

Her husband worked on the Manhattan Project; during World War II, the couple organized a committee at Yale University to assist displaced academics from Cambridge and Oxford, and their families.