If you want a good, succinct retrospective of her early stuff, she has a collection on Rounder called "Now That I Found You: A Collection" from 1994. It was released when she was VERY popular with her "When You Say Nothing At All" single and when she scored the "Horizon Award," Female Vocalist, single of the year for the song mentioned above and "event of the year" for her duet "Somewhere In the Vicinity Of The Heart" with Shenandoah. Oh, that record sold 2 million copies as well, her most successful album before Raising sand.
Her 'solo' stuff like "Forget About It" and the album "Lonely Runs Both Ways" are favorites of mine as well.
"Timelessness is not often overdubbed." - Rodney Crowell