After matriculating from Pretoria Girls' High School she started work in 1939 as a cartographer in the Survey Department of the Witwatersrand Gold Mines.
Born on 11 September 1897 in Pretoria, South Africa, Theiler graduated from Pretoria Girls’ High School and spent a year at Rhodes University College in Grahamstown, South Africa, before transferring to South African College in Cape Town, where she graduated in 1918 with a Bachelor of Science degree.
It was renamed Pretoria High School and became the first of the so-called "Milner" schools in the Transvaal, opening on 3 June 1901 with Charles Hope, who also founded Potchefstroom High School for Boys, as headmaster.
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