What's Janet Yellin'

Federal Reserve Governor Janet Yellen said today in Hong Kong that "U.S. stocks are not massively overvalued". She seems to be expressing a point of view that stocks are overvalued. Why would the Fed get into the game of stock price commentary? In the same speech Yellen defended the Fed's posture on low, or no, interest rates in the forseeable future, suggesting that this approach is not spurring speculative capital activity.