-Irrisen, near the Hoarwood.
-Normally a hag gives some leeway to the daughter for her to join her or not, which makes things easier for the changeling to avoid the mother since she is really powerful. In Ahti's background, her mother went after her, so she must be special. There is not much information about changelings but I think it is safe to assume that the hag has some way to find her daughter, so how you managed to flee from her from the north all the way towards Cheliax? Did you get some help? What is keeping your mother to take you? Perhaps her bauble? Perhaps the Hellknights helped her?
-From what I can tell, Changelings seek out the Hag. Mostly it's just been luck and decent Disguise uses. More in a PM I'll sent shortly. It's very likely she had Hellknight help though.
-I had thought she'd work with them. Not as an official member, of course, but more of a on-call mercenary. For some reason I hadn't realized there were no Hellknights around.
-The bauble was just a bit of a flavor piece. Like a holy symbol for the Eldest.
-I admit I have trouble creating contacts and allies for characters. It's not my strong suit, but with her travels it probably wasn't going to be easy anyway.
-Bitterness and a slow-stewing desire for revenge.