What do I do if the police do not properly assist in pursuing a person who stole from your home?

My ex-girlfriend stole a great deal of valuables, and personal information, including my social security card from my parents’ home. She had stayed the night, but was supposed to leave early morning to take her daughter to school. She woke me at 2:30 in the afternoon, as I later found, and she admitted to going through my whole home and taking the stolen property. She had claimed to the police that I assaulted her, and after I called the non-emergency line and reported that she stole from me. I was arrested that night, then the next day the charges were dropped, and I was released. After calling my arresting officer, which I attempted to report this crime too but instead was myself arrested. He informed me that this is now simply a civil matter to be taken up with the courts. I fail to see how stealing my identity, and over $500 worth of electronics, and other valuables, is something that should just be brushed off by the law and taken to small claims courts. What are my legal options?