She is unwell for the last three shows of the run.
House soprano Ann Toomey replaces her as Musetta.
Lyric Opera tweet:
Change of Cast: Ryan Opera Center soprano Ann Toomey to portray Musetta in the final three performances of LA BOHÈME, replacing Danielle de Niese who is unwell. #LyricBoheme pic.twitter.com/KtXG1vWlGj
— Lyric Opera Chicago (@LyricOpera) January 25, 2019