You aren’t present in her therapy sessions so you can’t say with certainty what exactly she is discussing.

Is she a minor? Incapacitated? If not, then it’s her privacy and her rights and her money.

You aren’t part of her therapy. I am married and have an adult child and I don’t believe I have rights to investigate what they discuss in their therapy and “explain” to them how I think their therapy should go. This woman isn’t your family or wife or your child even a girlfriend. Her therapy isn’t your business.

I recommend you see a therapist yourself and get to the bottom of this preoccupation. You also might need help with moving on. Relationship is over. How our exes conduct their therapies is their business

In addition insisting that someone has certain mental illness and diagnosis and insisting someone must get treatment and must get better could end in trouble for you.

Personally if someone insisted I have a disorder and my psychologist is wrong and my treatment is wrong and they know better what treatment I need etc I’d get law enforcement/legal professionals involved, I’d speak to my lawyer about it and ask them to interfere on my behalf.

What you do is inappropriate and can end ugly.