Are you sure you went "forward" of the boiler room? That should had been a shoulder or brisket hit... and in my experience, makes for alot of blood early, but then peters out very quickly......

You can definitely rule out heart and double lung b/c after an hour she was still alive.... It's possible you got a quartering forward single lung hit.......... Especially if you have bubbles fairly quickly on the trail........A single lung animal will definitely act hit, but can survive and will many times take quite awhile to die, if they die.......

Not much help here, but stick with it.