Sis: I doubt very much that they will permanently cancel all chemo. It sounds like the partner wants to give your sister a chance to recover from a reaction, probably to the gemzar. And if tarceva is not working, or the entire combo is not working, another targeted drug, avastin may work with a different chemo. Your sister's regular oncologist will most likey switch to a different chemo and maybe avastin.
If they should happen to send your sister home without further treatment, then it is time for a second opinion at a major comprehensive cancer center. Actually, it is always good to get a second opinion at any time.
Don M