If by "halcyon days" you mean her winning further Grand Slams, I believe they are over. I predicted, after she won the US Open, that she would never win another Slam event. In the US last year everything went spectacularly right for her. The stars were aligned, the draw fell in her favour.
She is a fine player and I do not wish her to fail. I just don't think she has what it takes to win big tournaments.