Suicide Death Investigation Reopened Based On False Murder Accusations As Retaliation For Restraining Order

Hi so my mother committed suicide back when I was thirteen. Due to my aunt harassing me, blaming me for my mother's suicide, and threatening to kill me as revenge even though I was a child I filed for a TPO in January. I have had to get it repeatedly extended due to my aunt avoiding service although now she has been served. As retaliation in response to the TPO, my aunt ended up calling the police department in my hometown with false accusations of murder directed towards me and my dad. Even though my aunt didn't make any of these statements under oath nor a police report nor any evidence whatsoever, the police department decided to reopen the investigation surrounding my mother's death. This seems very strange to me and it is clear as day that it was to retaliate in response to the restraining order.

Is this considered a violation of the TPO (ie harassment by a third party being LE or abusive litigation) and/or a violation of our right to due process? I am very confused as to why the police department reopened the investigation without any basis whatsoever - just a phone call with some false accusations made by my aunt. From my understanding a death investigation needs some form of evidence to be reopened and there is none whatsoever that my aunt has provided. My aunt has cyberstalked and smear campaigned us for over a decade and I believe her end goal is to either have us wrongly imprisoned or kill us.