Only proof of life I've seen up to 11:53 am EST:
The picture appears to be from her 85th birthday celebration. Did they darken the background make it look like she was in a theatre?
Looks like this may the same March event in this December 21, 2018 article. (She was missing then, too)
Ruth Bader Ginsburg Had Surgery for Lung Cancer, But Everything Looks Fine Don't Panic
Trump needs to say something in the SOTU about a way to guarantee that Supreme Court Justices are fit to serve. For example, a requirement that they MUST be present in court for oral Arguments and to cast any vote.
Only proof of life I've seen up to 11:53 am EST: