Mixed messaging is deliberate. Depending on which side of "the worldview" one stands, will start discussions. No issues with that, for me at least. Similar for not really following the book.

Unnecessary though, are abrupt and cringe bits and pieces of "The Message" and politics, which never are factual, nor common sense even, and instead just individual, and often current opinions inserted and ideologies injected, that mostly do not age well. Some actors joined that club, others just do their job and what they are asked to do. Don't know if Ella is the former or the latter, but she obviously did an excellent job playing this character overall.

Ultimately, regardless of "mixed messaging" it is quite clear that our main character is NOT well, and excuses for all done are just her own, inside her head, that as more things progress, less convincing they become, utill they shatter, "exposing" a killer looking to get away with it..