“Peace for Mary Frances”, a new play by Lily Thorne, receives a world premiere production by The New Group starring Lois Smith as a fading matriarch of a very dysfunctional family, waiting to die in home hospice.  Hyper-realistic, brimming with both tedium and spasmodic explosions of family feuds, death isn’t always the most compelling experience to observe, but that turns out to be the point.