did the therapist come to this conclusion after doing diagnostic testing or is it just her opinion.

I can see how she would make this determination. Depression does have a variety of dissociation symptoms that are shared with DID. theres a lady in the depression group here that does not have DID but during her depressions highest points will hear voices in her head, experience black outs/time loss, erratic behavior and moods that could be misconstrued as being a switch into an altered personality.there are also some therapists who refuse to believe in the DID diagnosis unless there is diagnostic testing to back that disorder up. My therapist has had to go to court many times because some of her DID clients have gotten in trouble with the law, DHS and abusers claiming false memory syndrome induced by a therapist. my therapist refused to acknowledge it in me until I had testing done.

If its her opinion let the therapist know how you feel. if you feel you do have DID tell her politely thank you for her opinion and ask her to refer you to someone who does diagnostic testing for mental disorders.

but keep in mind it might be depression with dissociative symptoms but not enough to be DID.

in my opinion its a good thing not to be DID. I'm integrated now so technically I'm not DID any more. I'm just me with depression, anxiety and dissociative symptoms and I wouldn't change that for the world.