I read online after she died that if someone dies on Rosh Hashanah they are a Tzadik - a righteous person. But considering the time the news came out about her death, it sounds like she may have died on the eve of Rosh Hashanah, and I haven't seen anything about what that would mean.
Personally, I think it is an odd "coincidence" that one of the US Supreme Court Justices would die at the time of Rosh Hashanah, considering that Rosh Hashanah is believed to be Judgment Day, when all the world passes before God.
And since people have been out in the streets for months crying out "no justice, no peace", if nothing else it is worth digging into ones Bible to read about justice and judgment.
If one is not sure what to think about things, maybe this is the best approach? :
Gen 37:11 And his brethren envied him; but his father observed the saying.
Dan 7:28 Hitherto is the end of the matter. As for me Daniel, my cogitations much troubled me, and my countenance changed in me: but I kept the matter in my heart.
Luk 2:19 But Mary kept all these things, and pondered them in her heart.