Her career took off and was sustaining momentum before Miramax and Harvey Weinstein was much of a force.
https://www.datalounge.com/thread/30187043-actresses-who-were-going-to-be-the-next-big-thing...but-weren-t-
As of now, I think actor Tom Cruise.
Roberts had a great career in the 90s and mid-2000s. Ironically, I think it was 'Oceans' film she was in that I felt both her and Bruce Willis marked they've landed just beyond par from the green -- that's if I'm thinking of the right film.
As for a current, fading actress... I'll need to ponder a bit.
Scarlett Johannson is trying to fill her shoes now. Others are trying as well.
shareSandra Bullock, Jennifer Lawrence and now Margot Robbie are on the list. Sandra is older but was on top for awhile.
Cate Blanchett is equal parts prestige actress -- like Meryl Streep -- and popcorn star like Julia Roberts. Sandra and Cate were the Brad and George of Oceans Eight..