My ignorance showing it's head again, I had no clue about this Haletha and how she's involved with the Hedgewise.
I'm also not saying the Widow is our best lead, I never said that.
Here is what I said, even taking some inspiration from what you've said.
-Salyak is Shallya.
-The Widow, and thus the Ice Witches, had some unspecified problem with Ranald.
-Ranald had twins daughters with Shallya (it is twins, I'm not remembering wrong?)
-These daughters are in hiding, and their worshipers take that seriously.
-Then the Hag Witches deal with more obscure spirits and such.
All of this is why I feel like the Hag Witches are the best lead. On that note, is it a popular sentiment that Haletha is the lead? I can't really tell why. Is she supposed to be one of the twins? All I see is that she's the 'protector goddess of the Hedgefolk'. So is she supposed to be another facet of Shallya, and thus her daughters are hidden away in the Hedgefolk pantheon?
I guess I can see that, with how reclusive and secretive the Hedgefolk are.
Seems like a good lead, but as far as I know we still lack any explanation for the Widow-Ranald conflict.