Beis Rivkah, named for Rebbetzin Rivkah, wife of the Rebbe Maharash, is the Chabad network of girls' schools and teachers' seminaries. These letters (roughly 1949–1970) are addressed to its administration. See also Family life – The role of the Jewish woman.
Its mission. The Rebbe stressed Beis Rivkah's mission to raise generations of Jewish women who embody Torah values (IK 6627), and that supporting such education creates lasting impact (IK 2662). Every new student adds holiness and merit (IK 9742), and actions rooted in holiness, especially in education, have eternal significance (IK 8822).
Learning without a break. He asked that Jewish education continue even during vacations, with special care taken for the girls then (IK 6964), and that vacation from Torah study be kept to a minimum (IK 7293).
Students and staff. He encouraged students to act on their good resolutions with confidence that G-d grants special help (IK 9771), and urged the administration to fulfill communal decisions wholeheartedly and in unity (IK 10857).
Sources: the Rebbe's letters cited above.