chakka35 is wrong, as are thousands of others. The police can be involved in any accident that comes to their attention. Drivers have duties in respect of an accident if there is injury to any other person, or damage to any other vehicle, or injury to an animal or damage to roadside property. The driver in those circumstances has a duty to stop and give details, usually to the other driver. In the case of injury, a certificate of insurance must be produced. If these things are not done, the driver must report the accident to the police as soon as reasonably practicable, and in any case within 24 hours. This is very much an over-simplification of the law.
You should not worry about the double yellow lines. What would be the position if it had been a child instead of your car? The woman seems to have committed two offences, careless driving and failing to stop & give details. The word 'crime' is out of place here and usually refers to an offence that can be tried at a higher court.