Gracie,
I have read over this post several times. I know how you are feeling and I wish I could answer you. I hope there are medical people, whom you can trust, to answer some of your questions. Every cancer case is so different and it's hard for anyone to really answer your question. I can just tell you that I have been at this site and reading for nearly 4 years and I've seen many people in the condition your sister, sounds like she is in, turn around and pull out of it. I just want you to know that I will be keeping her, you and your family in my prayers. Please keep us updated.
Hugs,
Sue