No, she wasn’t being rude.
According to promoter Daniel Nardicio, “Last Wednesday, during Liza and Alan Cumming’s show, one of Liza’s band members went into cardiac arrest on stage, didn’t know it, and continued to play till the end.
“Then, on the way to the birthday party I threw for Liza, he had to be taken to the hospital for a quadruple bypass surgery.
“Liza only left her birthday party early because she found out about it and wanted to stop by and see him.”
Ring them bells.
(That last line makes no sense whatsoever in this context, I just wanted to say it.)