I'm pretty much with the neighbors and the cops on this one. It was after midnight on a weekday, the woman was apparently drinking, and she was in her yard yelling and lighting fires. Yes, I am aware that fire can be sacred and that lots of groups and individuals use bonfires in rituals, but she was burning rubber mats and a cooler (that must have smelled nice) and pouring lighter fluid on it.
If one of my neighbors started screeching and lighting things on fire in the middle of the night when I was trying to sleep I'd probably call the cops too, Wiccan or not.