While waiting in the Arl of Redcliffe's estate in Denerim there is an elven maid named Nigella. I noted that she kept walking back and forth between the Arl's and queen's rooms and I assumed at first she is some kind of spy for someone. I could only talk to her once after each time I entered the estate, she'd be waiting midway down the hall. She would also say she's there to clean and would then excuse herself before she gets in trouble for talking to me. Right after that she tended to go from room to room, seemingly following me but staying low profile.
Is there anything to her? I tried to get more out of her but never could. I assumed she must have been part of some quest I never started. Just curious.
As far as Nigella goes, nope, that's it. There could be some other interaction buried in the toolset somewhere, and I think there was a project going on for her at some point, but never came to fruition. So, what you see now is what you get.