This unnamed woman was a friend of Alice.
This woman is a resident of Plainville and a roommate of her friend Alice. She considered Alice to be a nice girl, and admired her for keeping her promise ring and for never drinking or swearing.
When this woman returned to her shared apartment one night, she found Alice and Alice's boyfriend Russell torn to bits on the floor from apparently eating each other to death. She noticed that Alice was already dead while Russell was still chewing a little.
The woman found the sight very horrific and hard to believe. She was interviewed later on by Sam Winchester, who was disguised as an FBI agent.