Thanks so darn much for posting the track. I guess we could describe it as a contribution rather than a collaboration.
The middle section (from 2:08 to 3:20) includes some nice chords and is wonderfully fleshed out. Otherwise, in my opinion, the sound of the group seems too sparse and I am not quite sure if her rhythm section includes strong enough musicians to pull off such a reduced sound. I cannot quite put my finger on it yet something seems drastically lacking. It seems flat---which may be intended and if so, then it's successful.