I have never seen this, but i have been manipulated and hurt by people. This girl manipulated those around her and you were hurt. You were also hurt by the team of professionals misdiagnosing the both of you. Also letting her go on so long like she did was
probably not good either. I'm very sorry this happened to you. Her treatment and diagnosis shouldnt have affected yours. That was unfair to BOTH of you. You are separate individuals and each individual is unique and different. You could have both been DID. Two depressed individuals can act completely different. One might sleep all the time, the other maybe cant sleep at all. One might cry, the other might get angry and violent. Yet they are both just as depressed.
We are complex beings. I am more angry at the treatment providers than the girl who was "faking" DID. She is ill and needs treatment. She has a reason for her behavior. The counselors,
therapists or psychiatrists were just the same small minded unlistening numbskulls i' ve encountered too many times to count.