When Flattery Becomes Stalking...

A friend of mine approached me with a slight dillemma. She shared that she had befriended a girl new to the city who she met at school. She said she was a really sweet girl and they got along great. They spent time together doing all the things I used to do with her before I became this bore of a suburban mom. Clubbing, bar hopping, comedy clubs, lounges, concerts, shopping, the whole nine. Our friendship never changed, but our lives definitely did and I even joked with her about her and this out of towner being a "new couple". But over time the honeymoon was over and this friend seemed to become the creepiest of all creeps...The Unwanted Twin.

The girl who buys the same clothes as you, the same shoes as you, wears her hair like yours, wears the same makeup as you, talks like you, walks like you, becomes....another you aka...The Unwanted Twin !!!
Many people, especially only children grew up dreaming of how fun it would be to have someone there twentyfourseven who is so much like you, they must get you...EEEHHHH...big buzzer...Anyone who has ever met a set of twins nine times out of ten they are COMPLETELY different, and the only thing that is the same about them is they way they look or having to endure their parents dressing them alike as children. And who, really really wants someone walking around being...them. Even twins enjoy their individuality.
 IMITATION is supposed to be the sincerest form of flattery. But what happens when your friend begins to resemble your mirror image and is constantly in your face?
This scenario is reminiscent of a lot of friendships between females. A common danger among friendships between girls is that sometimes one person might be more insecure about the friendship than the other, and they might feel the need to copy their friend. Copycat friends often mean well, but when the similarities get beyond a joke, it may be time to re-evaluate the friendship.

So, I ask you, what is your advice for this friend of mine who is borderline scared for her life? Should she cut her off completely? Let her down easy? Stick around and hope her bahavior changes?
Have you ever had an "Unwanted twin"? How did the situation end up?