Original Commentary

Emily is remarkably clue-resistant. As far as she's concerned, she and Kimberly were friends in high school and things haven't changed from there... - Terrence

Modern Commentary
Like Syd Barrett said, "Emily tries but misunderstands".
There is no other way.

Why did it take Emily four months to hunt Kimberly down? She's got her phone number and address.
Emily probably made a new friend at work in the meantime, then they had a falling out. And now she's back to hanging out with Kimberly, her emergency backup friend. - Terrence