Gita,
Sorry I missed your post the other day. I have found that if you can't go through all the new posts at once, you may not get to some since they are all updated as being "not new" when you exit the site.
By now you probably have received treatment options from your siter's medical team. I am not sure if any tests at this point would be conclusive and I am not sure how the doctor would know if the new tumor is responding or not.
There are some options on the nutrition side that would help her body tolerate the chemo. First, if she has some type of central access (i.e. mediport, PIC line, etc.) the doctor can order TPN feeding with a targeted caloric intake. It is usually administered over 8-12 hours via a pump and can be done easily at home. Second, if the chemo was reduced because of blood count issues, there are drugs to boost the production of white blood cells (Neupogen) and red blood cells (Procrit). They are both quite expensive and the doctors may be hesitant to prescribe.
I hope you are taking some regular time to wind down yourself. Things are getting pretty tense by now, I assume, and may even get worse as you try to help your sister battle this horrible disease.
I don't know if any of this helps but I will pray for comfort and healing for your entire family.
Ed