Streep's accent
I have a question for anglophones, since I'm from Italy and my mother tongue is not english. Streep's character doesn't have a typical american accent, my guess is that she has a mid-atlantic accent. Is that correct? Or is it just a posh accent?
Also, I have watched child's original videos, obviously Streep has done an awesome work copying her voice, was Child's accent a mid-atlantic as well?
Thanks for the help.