Bernie, there was no threat of violence against any person, just against the dogs. Police won't act in that case and RSPCA will only act if there is actual cruelty.
I would talk to her immediate neighbours and see if you can get a better handle on her situation. It could just be that she was off medication or high on something illicit.
I might be wrong here but if you put in a report to the police and say YOU felt threatened they will be obliged to take action. They cannot take a report just for the record - but as I say this may be incorrect. Ask the police what would happen before you file a report if that is the route you are going to follow.
Border River Pet Resort