Sister Rita Callanan has endured a year from hell after a court battle with Katy Perry over her order’s Los Angeles convent — a fight that, she says, has left her nearly paralyzed, penniless and without a home. Callanan, the only surviving sister of the Order of the Most Holy and Immaculate Heart of the Blessed Virgin Mary, also claims that the singer has “blood on her hands.” On March 9, 2018, Sister Callanan’s best friend, Sister Catherine Rose Holzman, 89, collapsed and died in a Lo