She made a conscious decision to go all-natural.
Her film debut came in 2012 in Smashed, and she has gone on to play bigger roles in films such as Breath In, The Martian and as the super-soldier from the future in Terminator: Dark Fate.
Davis did a lot of prep to get her body ready for Terminator: Dark Fate.
The franchise had previously played with the concept of alternate timelines in Terminator Genisys.