My Mother Has Had 2 Very Aggressive Chemo Treatments, And

My mother has had 2 very aggressive chemo treatments, and she just had a Pet scan done with great results, just wondering do you think they could skip a treatment, as she is very very weak? The cancer seems to be gone everywhere but maybe the upper right lobe of her lung but they can't rule out inflammation and she does have a cough, we don't go to her Dr. til Monday