Are you thinking of Émilie du Châtelet? (https://en.m.wikipedia.org/wiki/%C3%89milie_du_Ch%C3%A2telet https://en.m.wikipedia.org/wiki/%C3%89milie_du_Ch%C3%A2tel

Are you thinking of Émilie du Châtelet? (https://en.m.wikipedia.org/wiki/%C3%89milie_du_Ch%C3%A2telet https://en.m.wikipedia.org/wiki/%C3%89milie_du_Ch%C3%A2telet) I don’t think she counts as a “trendy” student of the Principia. She translated the whole thing into French and wrote her own commentary on it. Certainly understood it at a much deeper mathematical level than Voltaire himself did! That said, it was certainly a trendy topic of conversation in Enlightenment salons, even if few people actually read it for themselves.