The time between diagnosis and treatment can be excruciating, but be patient the doctor will develop the time table for treatment. I am surprised your sister has a diagnosis without a biopsy. I got my news from the doctor who did the biopsy, and quickly; the other details came from the oncologist. Your sister will probably be advised to get a genetic test, too. Make sure YOUR mammogram is up to date. I am a survivor and have been clear for 8 years. There is hope. And, she has you for support.