Witherspoon and Nicole Kidman, who starred in the show, were also its executive producers, reported Entertainment Weekly.
Shailene Woodley also played a prominent role in the series, which was based on the book of the same name by Liane Moriarty.
The Australian author recently revealed that there had been talks about a second season.
"Yeah, Nicole and I just spoke about it three days ago. We're talking to Liane Moriarty, who wrote the book, about how could these characters go on, what would happen? We definitely left it open-ended so there's a possibility there," Witherspoon said.