According to the wiki on her, her commentary on the principia included "a profound contribution to Newtonian mechanics—the postulate of an additional conservati

According to the wiki on her, her commentary on the principia included "a profound contribution to Newtonian mechanics—the postulate of an additional conservation law for total energy, of which kinetic energy of motion is one element. This led to her conceptualization of energy as such, and to derive its quantitative relationships to the mass and velocity of an object." So no, it wasn't just a translation of the principia. It seems she was also a philosopher and an early financial pioneer in developing financial derivatives. https://en.wikipedia.org/wiki/%C3%89milie_du_Ch%C3%A2telet https://en.wikipedia.org/wiki/%C3%89milie_du_Ch%C3%A2telet