Mother's death, lingering Jacket, and missed Train

"I dreamed that my mother had died, but I don't remember anyone telling me. I just knew it, and everyone around me was acting like I should already understand what had happened. We were at home getting ready for something. Her shoes were by the door and her jacket was hanging on the chair, so I kept expecting her to walk in. I tried calling her phone, but it rang from somewhere upstairs. When I went to look, she was sitting on the edge of the bed. She looked completely normal. I started crying and kept saying, “You're not supposed to be here,” which made no sense because I didn't want her to leave. She asked me if I had eaten anything that day. I couldn't answer. Then she started packing a small bag, folding clothes that didn't belong to her. I asked where she was going, but she just said she'd be back later. The dream changed and I was at a crowded train station. I could see her on the other side of the tracks, waving at me. I tried to get over there, but every staircase led back to the house. By the time I reached the platform, the train was gone. I was still holding her jacket. I woke up with that heavy feeling in my chest, and for a few seconds I forgot she was alive."