I really like Curtis Sittenfeld, I think her characterisation is spot on. Very realistic and subtle. She has written one called “Prep”, essentially a coming-of-age story, that took me right back to being 15 or so. Really good.I’ve just read Rodham: What if Hillary Hadn’t Married Bill by Curtis Sittenfeld. I really enjoyed it. Also the first book I read by the same author was The American Wife which was fiction but based on Laura Bush. Another good read.
Two other American writers I’ve found that avoid the “kooky twee adult woman is surprisingly incompetent for a high-flying professional” are Ann Patchett and Taylor Jenkins Reid. Very different from each other- Patchett is a bit in the Anne Tyler mould, but a bit more unexpected, but TJR is much fresher and cooler- she writes about film stars and 70s rock bands.