I know from personal family experience that not all people vomit upon receiving a concussion. In fact, said person has never vomited, and they've had multiple concussions, both mild and severe.

As to the bleeding, I can't attest to that part. Would she have hit the window hard enough to crack it? In which case, she might be cut. Said person mentioned above was once in a car accident and actually slammed their head into the roof of the car. No bleeding. (Again, concussion) For that to work, though, you'd need to think about the angle of the accident and impact.

Just personal experience - I'm not in a medical profession