CAT scan cannot show anything of what you claim.
She was murdered.
Terri's eyes didn't follow movement in the room. That's instinctive.
Her brain was so damaged she lost basic abilities and instincts that rodents have.
There was no change in her condition for 10+ years.
While I think it would be better to put her to sleep than starve her, she felt nothing.
BTW: A CAT scan is perfect for detecting differences in material density. I.E. fluid vs. nerve tissue.