The old woman is a silver witchdoctor i believe. What clan are you? If its white sid i think its near the 3rd village. If its black side its in the plain of the dead.
dude go hangzhou its near fortress along with superior devas near the tree that mob is same as silver witchdoctor but different name
This helped me as well, thank you. "Suspicious Grandma" wigged out on me when I first hit her then she reappeared and I killed her and got the credit. Go to HZ, she spawns by the "T" in The Fortress of Majesty