So sorry for your sister's diagnosis. I lost my husband February 22, 2008 to this horrible cancer (stage IV diagnosed 3 years ago). At the end his symptoms were inability to eat (swallow); these were his first symptoms ironically. He was very weak, vomited when trying to eat and slept alot. At the very end he refused all food and liquids and slept most of the time. He was kept comfortable with morphine (for pain), haldol (for restlessness) and lorazepam (for anxiety). When his breathing became rapid and shallow, the hospice nurses told me he had maybe 24 hours - he lasted 13. The change in breathing is a normal sign that dying is imminent. I will pray for you and your sister.
Diane