Re: question about dormant cancer cells
I think it's probably coincidental that she now has non-small cell lung cancer. First of all, squamous cell and non-small cell are two very different types of cancer, and one does not mutate into the other.
Second, if her cancer had spread from the cervix, it would have spread first to places other than the lungs. The bladder, the lymph nodes in the groin, etc., are much closer to the cervix and would likely have been affected before it got to the lung.
I'm sorry to hear about your sister. I know this must be a terrible time for you and your family, but never give up. And you may want to check out the Lung Cancer board, as I know of at least one person on there who has been surviving for well over a year with very advanced lung cancer, and he's doing reasonable well at the moment. There are some amazing treatments nowadays that, if they can't cure, can certainly extend life quite a bit.