It occurred to me when I had breast cancer that loved ones get such a raw deal. Everyone focuses on the sufferer. Of course, it's a frightening and awful time for the person who has the disease. However, it is passive, in that you have to 'roll with it' with your diagnosis and treatment. Loved ones often get forgotten and feel so helpless. My DH sat in the carpark at the hospital and sobbed and sobbed when he dropped me off for my 'big op' (over 6 hours).
So it's really important to support those people who support.
All I can say Worriedgran24 is we are thinking of you and understand your worry (I have also been in your position with my mother and 2 sisters). Do try (I know it's difficult) to remember that so many people are successfully treated these days. Treatments are much better.
I do hope it doesn't mean your DM having to undergo yet more treatment but as she has been monitored, as a previous sufferer, they will be thorough. I so hope it's the best possible outcome for her. I am thinking of you and understand how difficult it is.
flowers