Just diagnosed with Stage 4 mets in Liver and Bone

My Mother-in-law was given the results of her PET scan today and she has mets in her liver and spine I am just learning about breast cancer and do not have her labs and left most of my information at her house so that I could come home and get on the computer to join this web site. I am not using all of the medical terminology at this point but I will add those tomorrow, I just wanted to vent tonight and also see what I could find out. OK this is how it started. Gigi had ductal breast cancer in 2011 and she had the the radiation beads implanted at that time but no chemo and no mastectomy. In 2012 she was diagnosed with a completely different type the doctor said it wasn't a re-occurrence of the first type as this was Lobular. She had a Left mastectomy, Chemo and radiation and tomoxifen that she continued on until 2 weeks ago. The entire process was horrible for her if there was a side effect, she had it, from thrush to c-diff, her skin peeling off in sheets to name a few. Since October of 2014 she has been feeling bad and has been to the doctor for several different things. In December she was diagnosed with a broken rib and since that time she has gone downhill. She told me that she knew the cancer had returned, Her doctor said he didn't think so and would not order a scan but did blood work and everything was OK. She was seeing the Oncologist every 3 months and he also said dhe was OK. 2 weeks ago she had to have an Ultrasound because she had been nauseated and having pain and the doctor thought that it was her Gall Bladder. The ultrasound tech saw the mass on her liver and sent her to the oncologist that day. That was the 15th of March. She had a Pet scan on the 26th and today we got the results and she has liver mets and spinal mets at the 6th thoracic vertebrae and they are waiting for the lab tests for the genotyping (I think that is what it is called) and the tests to tell exactly what kind it is. Since the 15th her Oncologist has left the practice for some reason and when we got to her appointment today there was a new Doctor there. She seems really a lot better than the other one she had but it's just a little unsetteling to have a new doctor at this point. Can anyone tell me what I can expect or any advice? She has 5 sons and one daughter who is not here at this time and she has asked me to be her caregiver, which I am honored to do but I need help knowing what to read, who to call what to do. Does anyone have any advise on where I should start.