The morgue was usually located in the basement of the hospital or in the area adjacent to the operating room and emergency room. In addition to the mortuary, the basement of the hospital might also include a parking lot, equipment room, medical record room, radiation therapy and nuclear medicine department, canteen, and library. Therefore, not all basements in hospitals were morgues. They had other functions and uses.
She might have survived by finding sources of water. There could have been a leaky pipe or some stored water containers in the basement. For food, perhaps she was given small amounts sporadically by her captor, or she found some old stored food items that were still edible.
It depends. A basement may count as a story in specific situations. If it has a significant amount of living or usable space, is fully finished, and is an integral part of the overall building structure in terms of design and function, it could be regarded as a story. But if it's just a small, unfinished storage area or crawl space, it usually wouldn't be counted as a story.