I believe the woman is standing right outside her door in D-3 I think. Talk to her and she'll give it to you. And if she's not there, just bring up your map and explore all the places where there are huts (except for the main part where the portal is) and you'll find it. Just read the map carefully.

Shujinko, the so called "Champion Of Elder Gods" is running around looking for Edenian Pie? Bah! I laugh at that!

Lol... for such an important guy with such an urgent mission he spends lots of time doing crap... like studying under Nightwolf for years... he needs a sense of priority~

Damn. I wish I could give you coordinates.
All I know is from a very confident woman coming out of a house. Its hilarious!. She gives you: SPOILER
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.A poisoned pie to the guard who decides to be selfish and not share it with anyone. After he eats it, you talk to him.....and he dies.