@ranjeetshih I am glad you clarified that the memory issue is ongoing, not just of the event. Have you considered taking her to an ER with a good connection to neurology? She might need another CT scan followed by MRI. I am not saying that to scare you. Her brain may be suffering from severe concussion, which is not dangerous, and as I wrote before young brains tend to heal faster and better than older ones. If it is a concussion, maybe you can find a clinic or specialist who is good with that. The main thing is to make sure there is no brain bleed. It sounds unlikely and the memory issues existed at the same time that the CT was negative for bleeding.

My daughter had a brain bleed after being hit by a car (in the cerebellum mainly) and was in an induced coma, and didn't remember things for more than 3 months. But we don't know if that was from the injury or from the sedation. I totally get how you are feeling! She went on to get her PhD a few years later.