The web page you copied and added your own selective quote marks to speaks for itself. Isn't Google wonderful?
In her autobiography, Mary explains that through her whole career she was "impelled by curiosity." She writes that other archaeologists should try to satisfy their curiosities by hunting for more concrete evidence, rather than spending all their time formulating crazy hypotheses based on a few random scraps of bone. In her words, "Small pieces of the record have been preserved and can sometimes be found, but it cannot be stressed too strongly that they are indeed small parts and what we uncover may give us a biased view of the picture as a whole."