She published the first trilogy, which begins with Assassin's Apprentice, starting in 1995. I saw the books when they first came out and I assumed from the title and the cover that it would be a cheesy fantasy by the numbers, so I never bought it. But I kept hearing about these books from other people who liked SFF, so I finally picked up the first trilogy.
I was completely wrong. It's not at all by the numbers. While it's not trope-free (nothing is), there are all sorts of interesting ideas, from the political to ecological. As you read the later series, the world opens up quite a bit, and it gets even more interesting. The final trilogy brings so many elements together, and the ending is shatteringly powerful.
While this is epic fantasy, it's _not_ at all grimdark. Bad things definitely happen, but it's more hopeful and humane than something like Malazan or Song of Ice and Fire.
I can't recommend these books highly enough. Even if her writing is slowing down, I hope that she's satisfied with what she's done. This series alone is an enormous accomplishment. To build a world across so many books, across so many years, and have it come together so well in the end is massively impressive.