Did they say she has a concussion? If so, things will get better but it takes time and requires patience. She may need a break from school, time off from computer and phone screens and so on. It is excellent that they did not find a brain bleed. She is young and young brains are very resilient. It is called neuroplasticity.

Keep in touch with her doctor and a neurologist if available if concerns continue.

In the US there are concussion clinics. Not sure if you have that in India.

Is her neck okay?