I've put some more time and thought into Zush' backstory. She also plays an accordian - one of those small, palm-sized squeezeboxes, not these monsters. Now she's a little more racist and sexist because That's How Drow Culture Be, but she's working to get over it.
Outside of her current campaign, I imagine that she's a member of Syla's crew on her airship. The entertainment. The moralekeep, if you will.