They replace lost volume as a person is losing it...some folks in critical situations lose more than that. You don't think they'd let her lose even half without starting replacement, right? Use yer noggin...
LukeL, you said RAPID blood loss. Now you change the story to loss over a 6 hour time period. Rapid means bleeding out in minutes, not hours. Also, you were being transfused with blood the entire time, so the loss of blood at any given moment might have been only a few percent, not 150%.