Is My Daugter Autistic or Possed By Evil?

My daughter has been acting crazy for a while, so I took her to a psychiatrist and he said she thinks she has autistic, then I took her to my pastor and he said she was possed by a demon. Could it be both, because she's growling and it's getting scary, I actually tried to drop of in front of T.G.I Fridays and drive off, but when I turned back she was still there smiling, in the backseat. She is scaring the $h!t out of me, I want to tie her to her bed and set the house on fire, please help me banish this demon.