But she hasn't had all the more valuable tests to make that determination.
The only tests she hasn't had is an MRI and a PET scan. And I'm' not even certain about the PET scan. And you've been told the excellent reason she hasn't had an MRI.
She had a court appointed guardian who WANTED her to live. He wanted every test available done to show that she was NOT PVS. Ultimately, he felt he had failed her.
Read the court testimony and/or the guardian ad litems reports.