This is an idea I got from the discussion in fionwe1987's post about Graendal's allegedly flawed death.

I think the Domani Lady Milisair of House Chadmar, who stays as the most powerful noble and only member of the Merchants Council in Bandar Eban, might be the DF Domain from Ishy's DF Social in TGH, prologue.

Carridin notes in the beginning of TGH:
"Not far beyond the Illianer, another woman stood, alone and admirably silent. With a swan's neck and lustrous black hair falling in waves below her waist, she kept her back to the stone wall, observing everything. No nervousness there, only serene self-possession. Very admirable, that, but her coppery skin and her creamy, high-necked gown-leaving nothing but her hands uncovered, yet clinging and only just barely opaque, so that it hinted at everything and revealed nothing-marked her just as clearly of the first blood of Arad Doman. And unless the man who called himself Bors missed his guess entirely, the wide golden bracelet on her left wrist bore her House symbols. They would be for her own House; no Domani bloodborn would bend her stiff pride enough to wear the sigils of another House. Worse than foolishness."

Milisair is described by Rand TGS, ch.29:
"Shortly, Milisair Chadmar walked through the doorway past the Aiel guards. She wore one of those famous Domani dresses. It covered her body from neck to toe but was barely opaque and clung to every curve — of which she had more than her fair share. The dress was of deep green, and she wore pearls at her neck. Her dark hair, in tight curls, hung down past her shoulders, several locks framing her face. He hadn't expected her to be so young, barely into her thirties."

The body, the hair and the dress pretty much fit the DF Domani. Milisair also seems quite ruthless and ambitious; common DF traits. Plus, if she had Graendal's support, it might better explain how the relatively young Milisair could stay in power. Finally, maybe besides putting Rand in a bad light, she had to die, because Milisair could give informations about Graendal or the Shadow in general away.