Julianna Margulies Is Battling Chicken Pox
05/05/2016 AT 01:25 PM EDT
The Emmy Award-winning Good Wife star was scheduled to attend a New York city cocktail party in celebration of the release of her children's book Three Magic Balloons, featuring illustrations by Grant Shaffer.
The book, based on a story Margulies' father wrote for her and her sisters when they were children, follows three young girls who embark on a magic adventure after they are rewarded for their kindness by a mysterious balloon man during a trip to the zoo.
Margulies' battle with chicken pox comes just days before The Good Wife's series finale, which airs Sunday.
The actress, 49, recently opened up to PEOPLE about how she had a particularly hard time in the first season.
"I was so overwhelmed with being a new mom and being the lead of the show and trying to make everything work," Margulies told PEOPLE at the show's series finale party at New York City's Museum of Modern Art. "Anyone that has done a show can tell you that your first season is the hardest because nothing has been fleshed out yet."
The Good Wife series finale airs Sunday at 9 p.m. ET on CBS.