Her case is a little more complex as she was up for renewal. They wanted to give her a 70% reduction (Remember they do this to men as well - they were going to cut Leo a ton when they realized he was on the backside of his career). She said she wanted protections in case she wasn't as good after she had a baby.
"I asked Nike to contractually guarantee that I wouldn't be punished if I didn't perform at my best in the months surrounding childbirth. I wanted to set a new standard. If I, one of Nike's most widely marketed athletes, couldn't secure these protections, who could?"