Of Charles Philip's six children (five daughters and one stillborn son), Elisabeth Auguste was the only one to reach adulthood. She was the third daughter of Charles III Philip, then Count Palatine of Neuburg, and his first wife, Ludwika Karolina Radziwiłł. One of her sisters, Maria Anna, died before Elisabeth Auguste was born, aged one or two, and her sister Leopoldine died the year she was born, aged three. Her mother died on 25 March 1695, when Elisabeth Auguste was about two years old, and her father remarried when she was about eight years old to Princess Teresa Lubomirska. Her two half-sisters from her father's second marriage both died before turning three.