Normally, cops don't arrest for misdemeanors committed outside their presence, but an exception is when a "breach of the peace" occurs like here. Thus, the police could have arrested him if their investigation resulted in probable cause that he committed a battery. The victim could also have made a private person's arrest. Finally, aside from criminal law, there is tort law which enables the victim to sue for battery (and possibly other causes of action) in a civil court with the possibility of collecting punitive damages. The victim should see a lawyer immediately; don't delay because too long a delay can result in a loss of rights.
California attorney Sarkis Jacob Babachanian handles criminal defense, personal injury, civil litigation and bankruptcy (ch. 7) matters in the greater Los Angeles area. To discuss possible representation, feel free to phone Mr. Babachanian at 818-500-0678 or email him at email@example.com. The information provided is as a public courtesy only and does not establish an attorney-client relationship. Only a formal written agreement establishes an attorney-client relationship. In criminal cases, speak with nobody except privately with an attorney about your case facts. In personal injury cases, all cases are governed by statutes of limitation which create deadlines to bring your case, and if you miss the deadline(s) you risk forever losing your rights.
The police were wrong. That does not solve your problem. Do you have a name of the man who did this? Without it, you have no remedies available unless you can demonstrate some breach of responsibility on behalf of the theater.
Go sit down with a personal injury attorney to discuss possible remedies.
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.
I recommend you take her to the police department immediately and file a more thorough report. If they won't take it, ask to speak with the supervisor and make sure a report is taken. Save all of her receipts and medical bills. You will need that if the case gets prosecuted.
You also have a personal injury issue potentially. Start with the police report, then you'll need an attorney also. Good luck.
Anthony Muhlenkamp - 314-725-7777; firstname.lastname@example.org, Frank, Juengel & Radefeld, Attorneys at Law, P.C. Feel free to call or email me for a free consultation. However, please be advised that answering questions on this webpage is done to provide general information only and that by responding to a question we have not established an attorney client relationship. In order to establish such a relationship we would need to meet in person and go over more details of your case. Thank you.