"I have finished my examination of the Professor's body. I believe we, as well, should retire to someplace a bit more... private."

“He never was controlling her. It seems that whatever Parchment did physically altered her brain chemistry. Her EKG resembles that of a severe schizophrenic now. Such fundamental changes are... most likely permanent.” 

Context: Luna is explaining to Rarity and Applejack why Zecora isn't back to normal now that Parchment is dead.