I always find the beginning of this interesting... where the interviewer asks if she's ready and she says "I guess so" and doesn't look entirely happy, and then does this big sigh.... and then you see her flip the switch and put on her more upbeat interview persona... She's such a professional that she knows she has to put on a good face and be all upbeat in interviews, even if she's not feeling it. That's why I find it amusing when a lot of her fans think how she is in an interview is how she is in real life. "Sometimes she's an actress, but you'll never really know...." I don't mean she's being fake, I just mean she does her job, which is to make you think her life is great.
Also, though she seems quite lucid, look at her eyes. Her pupils are massively dilated. And she's in bright tv lights, so that's not natural. It's like her comment in the Oprah master class where she says she sees herself in videos and things now looking back, and thinks, wow, you're so high there. Couldn't yo u have laid off the drugs for even a little while? I see that here.