The underlying cause of her dangerously low oxygen level hasn't been found. X-rays and cat scans and other diagnostic tests are clear. Her heart, kidneys, liver and other organs appear to be functioning properly. The oxygen level in her blood is in the low 70s whereas it should be in the upper 90s for a normal person. Having pure oxygen pumped into her through a tube and mask has raised the level to the mid to the upper 80s but as soon as the mask is removed, the levels plumet. That means her lungs are not oxygenating her blood and yet they cant find anything wrong with either lung. She must stay on support until her lungs are functioning. there is already concern about tissue and brain damage from insufficient oxygen for whatever period of time it was between when she passed out until they got her on support at the ER.