Plastic breathing tube inserted through mouth into trachea to facilitate breathing. Typically hooked up to a respirator ("breathing machine") or a bag-valve device to deliver O2. The tube is called an endotracheal tube and the act of inserting it is called intubation.
Thanks! Boy she really was close to gone when they transported her. When this has to be done to a young person it can't look good from the med's perspective. Very sad, but once one thinks about it, not unexpected.