Her movie came out yesterday. I highly recommend watching it if it is in a theater near you. It is a very well made, entertaining documentary.
Does it cover the Scalia assassination at all?
No, it was a factual documentary and didn't delve into trumponian conspiracy theories like that. It did, however, have a significant part about Scalia including interviewing him about RBG. They both discussed their friendship at length and the obvious, polar opposite political views and contrasting constitutional interpretations. Scalia talked about how intelligent and pleasant she always was. RBG discussed how she frequently had to pinch herself in order not to laugh during serious moments because Scalia would whisper something hysterical in her ear.