See my other post,(I think its below your thread). Your sister is going to beat this!
The one suggestion I would make to you is to talk to your doctor about holding off on Chemo.
My mom who is 60 and also a non-smoker, was diagnosed with Stage IV cancer in March, originally, the plan was radiation (brain metastisis) & Tarceva This was about a 6 week process. With my mom's cancer, and the fact that she was recovering from two collapsed lungs, the doctors wanted her to be stronger before starting Chemo. They figured Radiation, Chemo, and Tarceva was just too much.
This may have been a blessing in disguise. After 6 weeks the doctor ordered an MRI on her lungs, which showed a reduction of well over 50% in the primary tumor (radiologist was amazed). The doctor who treated my mom also consulted with a doctor who my mom received a second opinion from (at Sloan) and they have actually decided to forgo chemo for patients who respond well to Tarceva.
I would recommend two things, first have your sister get tested for the EGFTR Mutation. If this test is positive (which is very common amongst the never smoker group), chances are your sister will respond to Tarceva.
Second explore putting off chemo with your doctor. Why put your sister through Chemo, if she does not need it. I am not a doctor, but I very much recommend at a minimum you have this conversation with your sister's doctor.
Finally, with all the new remedies coming out with cancer, and the fact your sister is athletic, young, and never smoked...the cancer doesn't have a chance!
Good luck and G-d Bless