Could I ask for a few prayers?

My one and only sister was diagnosed with breast cancer a few days ago. Thing is, we both had a routine mamograme only days apart. I knew that she was diagnosed with breast cancer before I even got my results. I feel so guilty because I am older and feel so guilty that I have had the all clear. She is soon to become a 'nan' again. I am broken hearted. Could you please pray that she willl be here to see her new grandchild. Thank you.