Suggest Treatment For Crumbled Pelvis

My Mother of almost 85years had a fall 3 weeks ago and fractured her Pelvis at the bottom under the left side, it has Brocken back and front. She was doing very well on the second week, walking with a frame taking herself to the toilet etc. then suddenly 6 days ago couldn t weight bare and was in worse pain than in the beginning. She has been told that the right of her pelvis has crumbled, is there any treatment for this.