Kaioshin Sama
Your post is too vague for us to make clear sense.
Mind explain why you think Sheryl's character development is in "a gimmicky sort of way" and how her personalities is "flip-flopping"?
You want us to reply you in a sensible way, don't you? Then you need let us know what you exactly mean. We can't give you any good answer because we yet know what make you think that way. Remember, even though this is not a Sheryl fan thread, most people here are Sheryl fans, and Sheryl fans would not think what you are thinking. Right?
btw I had
answered to the parts of your post which I could make sense. I'd be grateful if you take one minute to read it.