As Anne in Florian Zeller's The Mother at the Atlantic Theater Company, Isabelle Huppert is such a mess that to say it's a portrait of a woman in extremis would be a profound understatement. Alternating between confrontational aggression and toxic depression, everyone in her family has abandoned her, but who can blame them? And after sitting thru The Mother, translated by Christopher Hampton and directed by Trip Cullman, you'll probably want to leave Anne, too. It's a grim, 85 intermission-less minutes, made even more so by Huppert's frequently impenetrable French accent. . . .