Dear anns family: With the information you have provided, it is difficult to provide any specific answers. However, it is possible to have a sarcoma of the breast - I am unclear is this is the original diagnosis or a second diagnosis? Also, I am unsure as to why her hands and legs are both swollen? Is she on therapy now? Does she have any other medical problems? Whether or not to do chemo and radiation depends upon the specifics of the situation - has the cancer spread? Without more specific information, I'm afraid we cannot provide good answers.
there are several kinds of sarcoma, and various grades, all of which have different behaviors. So it's hard to answer your question without knowing a lot more. Swelling of the arm and hand on the side someone had a mastectomy can be due to the surgery and have not particular meaning as far as prognosis. Swelling of the other arm, and of the legs would not be due to the things going on in her breast alone; there has to be another explanation for it, whether it has to do with fluid problems, or low protein levels, or heart problems, or tumor in other places. So despite your concerns and need for information, there's not enough to go on to give you much. It seems the best way to get it is to confer with her doctors; nowadays, that can only be done with her permission, because of new laws regarding patient information.