This is very, very, very bad news.
The Republicans are certainly going to put a justice through before the new senate/presidential term starts. (This is despite blocking a nominee in 2016, when Justice Antonin Scalia died 256 days out from the election. At that time, the senate leader said it was too close to the election. He has made it clear that he is a sheer hypocrite and will push someone through with 50 days to go.)
That means the court will shift very far right. And that's it for a generation. I'm not exaggerating.
If there is any contestation about the election, they will toss the ballots and put Trump in power.
There goes abortion access, gun control, healthcare, and keeping money out of elections. For 30 years.
It's overwhelmingly bad.
On a personal note, she was an amazing woman and an inspiration. That it happened on Rosh Hashanah is such a cruel irony. What a way to begin a new year. May her memory be a blessing.