It's funny you should mention that bc I rewatched that the other day and thought about just this topic. I think Meryl's work in the (flawed, but decent) Manchurian Candidate remake - especially the scene above - was one of her last sharp performances before she descended into playing campy, somewhat anesthetized images of herself for almost a decade. Playing "Meryl Streep being Meryl Streep" by way of dreamy, snarky Miranda from Devil Wears Prada because an industry unto itself. In MC she is on point and on fire - I think the inspiration there was George W. Bush cohort Karen Hughes, among others.
I don't think she came back from that til The Post, where she was unafraid to be 1) vulnerable again and 2) weak or frustrating for a portion of the film, as opposed to the cliche Meryl Streep post-2000s image of the dragon lady/dry wit madam. She did a great job in that film, and too few saw it.
I hear she's good on BLL but I have yet to watch the show.