Crime of intentionally hurting others

First of all, to tell the truth, the police are very irresponsible in this matter, because according to the normal police procedure, the police should take both of you to the police station to make a record, and then identify your mother's injury. If it is a minor injury or more, it should be filed as a criminal case. Now you can ask the public security organ to issue a decision not to file a case. If he refuses to accept this decision, he may apply for administrative reconsideration to his higher authorities. You can also complain to the procuratorate and ask the procuratorate to supervise this matter.

Secondly, it depends on whether you want to investigate the criminal responsibility or civil responsibility of the person who beat your mother. If you want to pursue his criminal responsibility, you can file a criminal private prosecution, keep the stones, photos of injuries, hospital medical records and charge receipts, and file a private prosecution with the court yourself. If the evidence is insufficient, the court will ask the public security organ to file a case for investigation and evidence collection. At the same time, you can also file a civil lawsuit incidental to criminal proceedings, demanding compensation for medical expenses, lost time, nutrition expenses, hospital food subsidies, transportation expenses and other losses. If you just want him to compensate for the loss, then file a civil lawsuit.

Finally, I suggest that it is easier for you to ask a lawyer to operate on you. The lawyer's fee won't be very expensive, just a few thousand dollars.