Rosie O'Donnell is asking for help finding her missing 17-year-old daughter. Police in Nyack, N.Y., are hunting for Chelsea O'Donnell, who was last seen a week ago, and her mother tweeted that she “may be in NYC.” She may also need help. The teenager had stopped taking her prescription medication and needs immediate medical attention, the desperate O'Donnell said on her website Tuesday. "Chelsea, like millions of people, lives with mental illness," said O'Donnell's spokeswoman, Cindi Berger. "It has been a difficult road for Chelsea and her family and they just want her back safe." ROSIE O'DONNELL 'STOLE' ADOPTED DAUGHTER:...