Turns out she once covered Mother Stands for Comfort by Kate Bush. I'll have to let it sit with me for a while, but posthumous kudos for a non-obvious song choice!
I'll remember her mainly as Melody Nelson, subject of 1971 paedo concept album Histoire de Melody Nelson, which I remember reading about after Portishead cited it as an influence, but only really discovered a couple of years back. It's an astonishing piece of work.