My understanding also is that she voluntarily downed a number of jello shots in rapid succession just before the activities. She was "looking to party." However, BAC is not an measure of consumption, it is a measure of absorption.
"For normal social-type drinking, the highest BAC is usually achieved within 30 minutes after completion of consumption, though it could take as long as 60 minutes. When large amounts of alcohol are consumed over a short time interval, ... the absorption phase may not be complete for up to two (2) hours after last consumption."
That is consistent with the testimony that well into the "activities" she did in fact begin slurring and finally did pass out. It is also consistent with her admission that, at the time, the guys likely could not have known she "was not consenting," aside from the fact that she offered every indication that she was consenting. There was a point at which she clearly could not. The absorption curve suggests that was later, not sooner. It was also over at that point.