Perhaps Sarah was hoping that with doing the "Finding Sarah" series and follow up book, that would divert attention away from the Cash for Access scandal and all interviews would be about her remarkable insights, how great Andrew still is and how close they are and her adept skills as a mother. In other words, paint a bright picture of the "new and improved Sarah".
Yes, I think this is what she was hoping. Remember, Sarah was able to capitalize hugely on her past public disgraces. She blamed her behaviour on her insecurities and on a lack of self-awareness, and she spent the next ten or fifteen years telling the world how she'd followed steps to change. Sarah won a lot of public sympathy, because people related her insecurities and struggles. They bought her self-help books and identified with her weight loss journey.
So when Sarah found herself in public disgrace again, she decided her only choice was to build her public image up again in exactly the same way. Unfortunately for Sarah, times have changed: there's a new generation of royals, and Sarah has had years to "find herself" and change her ways - in fact, she spent the last ten or fifteen years telling everyone that her problems were people-pleasing and low self-worth! What a coincidence, that these were the only insights she gained from the Finding Sarah program!
Yes, I think Sarah is surprised that public opinion isn't turning in her favour this time around. We can bemoan her cluelessness and stubborness, but I give Sarah some credit. As Diarist mentions, she - an ordinary girl - married a prince, a war hero. She somehow won Andrew's heart. Then, just when the world thought she had hit rock bottom, she rose from the ashes to a very lucrative career, thanks mostly to the Weight Watchers' contract, and also to her ability to elicit sympathy from the public. Sarah was disciplined enough to keep her weight down for at least ten years and work tirelessly as a Weight Watchers' ambassador. I give her credit for that.
So, twice in her life, Sarah achieved public success far beyond what anyone would expect of an average girl with no outstanding talents. Because of this, I partly understand why Sarah seems so out of touch with reality right now. She had a luxurious public life for 25 years, and is convinced that she can get it again. I think the "two Sarahs" we see are real...Sarah can be strong-willed and intelligent (or maybe manipulative); but she also comes across as clueless because she doesn't understand that for the last 25 years, she's been living a public life that far outstrips her real market value. Or does she not understand that? I think the "insecure Sarah" that she so often references is real, because I do think that somewhere inside, Sarah remembers who she was before she married Andrew (a "nobody") and she is terrified of going back there. Without the royal connections, the public life and the wealth, Sarah doesn't know who she is.