My family's and my prayers go out to your mother and to you...remember you need the spiritual strength just as much as she does, maybe even more.
Please let her know that on my wife's family, there has been 6 out of 6 aunts including my mother- in- law, who had radical masectomies in their 60's and they are now in their late 70's. They are all enjoying their great grandchildren and they get together every other week.
God Bless.