Sadly, I believe you're exactly right.If she's still trying to sell some story that her kind of jacked up addiction was somehow superior to someone else's jacked up addiction, I'm thinking she's not far from a relapse.
I do remember the Diane Sawyer interview and the "crack is wack" statement. Only an addict will try to think their drug of choice is far superior/less harmful than another addict. It's a clear sign that they are in denial, and haven't truly hit rock bottom where they have come to terms and are honest with themselves and others about their addiction.
I haven't seen the interview with Oprah, but if she is still trying to split hairs on her addiction, she is still struggling heavily with her addiction and even if she is currently clean, she is dangerously close to relapsing. I hope that she continues to get help and she is able to resume her singing career. She had an awesome voice. From her "comeback" concert in Central Park, her voice seemed a shadow of its former self and it was hard to watch. Blaming that on talking too much on Oprah seemed like another attempt to deny reality. Could've been nerves. I don't know. It's all so sad.
I know she has or is about to release a new album. Is this new material or merely a greatest hits compilation? Has anyone here heard it?