During the first few days in the hospital, Katie had some special needs. With trauma covering 100+% of her body, it was very difficult for her to stabilize. One of the things they used to help her was an infusion of specialized plasma components. It is only certain pieces from blood plasma, and it is very specialized and requires many donations from many individuals to get even one bag. Katie received 2 bags.
The cool thing is that her father has been donating plasma regularly, and her sister has donated several times. It is entirely possible that portions of their plasma had been used when Katie needed it the most.