She was born in Moscow of Russian parents Sergei Ivanovich Selavri (Russian: Сергей Иванович Селаври), a Sworn Attorney assistant and Antonina Georgievna Stasenkova (Russian: Антонина Георгиевна Стасенкова, a medical doctor; born March 10, 1886, in Stavropol, reposed 11 January 1965 in Stuttgart), and was the older sister of Dr. Oleg Selawry (Russian: Олег Сергеевич Селаври; February 21, 1924 – February 12, 1999).
Shortly after graduating, she worked with Hans Krueger under the guidance of Ehrenfried Pfeiffer to develop Pfeiffer's medical diagnostic technique based on interpreting crystal formations of blood mixed in a copper chloride solution, also known as biocrystallization.
She maintained that blood crystallisation belonged to the "science of the future" based more on intuition than on strictly repeatable, clinical trial studies.
She also developed homeopathic treatment regimens based on certain metals, many of which had properties described in mythological stereotypes (for example, gold, the metal of Apollo, the sun god, was used to treat the heart, the "sun" of the body).
In addition to her contributions to medical science, Selawry wrote a number a theological books, including: Perpetual Prayer of the Heart, a biography of John of Kronstadt, and an unfinished book on virtues and vices.