She had no children, today she has thousands.

This past Monday marked the 22nd of Shevat, the 37th Yahrzeit of Rebbetzin Chaya Mushka Schneerson, the Rebbe’s wife. It was also the weekend of the Kinus, the Chabad women's leadership conference in New York, where some 6000 women joined for the annual celebration.
Rebbetzin Chaya Mushka, often called Moussia, was born in 1901 in Babinovitch, Belarus, into the leadership of the Chabad movement. A woman of spirituality and intellect, when facing Soviet oppression her father entrusted her with the authority to handle all legal matters on his behalf. In 1928 she married the future Rebbe. Together, they witnessed the rise of Nazism while living in Berlin, later escaping the Germans from Paris, before arriving to the safe shores of the United States in 1941. Tragically, her sister Shaina was murdered in Treblinka.
For the next 48 years, she faithfully stood with her husband, and played a pivotal role at crucial moments for the Chabad movement. She was known for her attention and care for the rapidly expanding network of Chabad shluchim, and their children.
In 1988 at the age of 86, she passed away after a brief illness. During the shiva, the Rebbe said that any number of words that could be shared about her would be insufficient, since "her true greatness is only known by G-d." In her memory, the Rebbe established a charitable fund to support educational and social services for women and girls, and encouraged others to learn from her life.
In May 1940, as France faced Nazi invasion, the Rebbe and Rebbetzin fled to Nice in southern France. During their flight, a devastating bombardment ensued. Amid the chaos, the Rebbetzin observed a shell heading towards a man nearby. She pushed him to the ground, to avoid being hit, and possibly saved his life. Decades later, she is said to have told a friend, "True, I may have saved his life, but for pushing a Jew down, one must do teshuvah."
Chana Sharfstein visited the Rebbe during the shiva and noticed the immaculate condition of the couch in their home—completely white and spotless. The pain she felt that day for the Rebbetzin's passing was magnified by her recognizing up close that the reason the couch remained pristine was due to the Rebbetzin's lack of children or grandchildren to play on it.
Although the Rebbetzin was not blessed to have children of her own, in the years since her passing, thousands of girls have been named in her honor. Numerous schools, mikvahs, sefer Torahs, and charitable organizations bear her name, and the world's largest conference for Jewish women's leadership takes place on her yahrzeit. Today, there are hundreds of women dedicated to leading communities who proudly carry her name. 
Mussie is one of those women.