That kicked off her conflict with Wonder Woman, although in the Rebirth origin, Barbara holds Diana responsible for her becoming a monstrosity.
Assuming that Kyle Buchanan’s information is correct, then Wonder Woman 1984 is definitely taking a cue from the New 52/Rebirth comic book eras with its adaptation of Cheetah’s origin by having her already associated with Diana.
For Wonder Woman 1984, apparently although Diana and Barbara start out on friendly terms, the latter’s pursuits to be like the former ultimate lead to her crossing over to the dark side and becoming a freaky humanoid cheetah creature.
While the precise details differ depending on what story you read, in recent years, Barbara Ann Minerva (historically the third individual to hold the Cheetah mantle) is depicted as being Wonder Woman’s ally/friend, but during one of her archaeological adventures, she is transformed into Cheetah.