I saw that same episode a while back. Afterwards, I just assumed she was an AKA. If you watch the re-runs of the show, you'll start to notice this constant pink and green thing going on with her character...in her old apartment, furniture, her clothing. Of course, unless you're actually looking for it, you wouldn't notice it. (Like Cedric the Entertainer said "It's just something that always concerned me")
I was completely surprised to read these posts, I always thought she was a member.