I think looking on while part of a conversation takes place between two people, it can be difficult to understand all that is taking place. From what little you have said, it does sound like the person suspected they might be bipolar, had seen quite a few signs and in talking to your T, was actually asking, "Does this look the same to you?" or, "What does this look like to you?" Your T replied, "looks good to be bipolar disorder, go see a psychiatrist, medication can help."
Diagnoses are for the professionals, not us. They made them up to help themselves kind of get oriented in how to best start treating. Just like we might have trouble remembering the difference between a cold, brochitis, flu, and a bacterial respiratory infection, the name, for us, should not be that important, mostly we tell the doctor all the symptoms we have and they judge from that.
I have asthma and caught a cold winter before last and then suddenly could not breathe so I had to go to the ER in an ambulance. They said it was bronchitis and gave me an antibiotic. Well, you might think, hmm, if you read anything online it says don't use antibiotics for bronchitis!
But, the small print

says:
Quote:
If you have no other health problems, experts recommend that antibiotics not be used for acute bronchitis. Whether your doctor prescribes antibiotics and what type depend on the type of infection you have, your age, any other medical conditions you have, and your risk of complications from acute bronchitis, such as pneumonia.
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from:
Antibiotics for acute bronchitis
I would only pay attention to your T when she is talking directly to you about your situation and conditions and I would not "trust" her particularly, I would see if how she treats you helps you! If you do/do not have PTSD is not the problem, what is done to treat it is, whether it is effective for you.