Chita has not missed one performance yet. Maybe she has the option to take a matinee off, but she hasn't.
Donna said this
Still, waiting in the wings can be nerve-racking. “I feel lucky to be there, but then I’m thinking, ‘Oh my God, I’m going to be very nervous if I have to go onstage,’ ” admits McKechnie, who, at 72, is 10 years younger than Rivera. “But I don’t worry about Chita — she’s healthy, she’s going to be fine. I just want to learn the role so I can do it at some point in my life. I’m hoping it’ll be later than sooner, OK?
Doesn't specifically state that she has no scheduled performances, but certainly doesn't have expectations to definitely go on.