Ah -- I really need to dig these out again, as it's been many years (they're in storage like most of my CDs). The duos with Moholo, Sommer, and Cyrille stood out the most to me at the time. I recall being less into the one with Bennink. I should revisit the duo with Favre; they did another duo CD called Ulrichsberg somewhat later that's quite nice, as well as trio and quartet dates in the '60s that are wonderfully heavy.
Too bad she and Mani Neumeier didn't link up again for some duets (at least not that I know of)...