If she is making continuous frivolous complaints to the sheriff and is continuing to harass you, then your next step is to file suit in court for harassment
and seek a restraining order against her continuing to call the police for the matter over the trees. Unfortunately, with crazy neighbors your choices are limited to either sue for harassment and/or get a restraining order or simply ignore them when the sheriff and everyone knows that the neighbor is crazy.
As far as her knowing information about you, much information is available in the public records and also on the internet, so there is no way to actually know how she has found this information about you and your family, but you would be amazed how much is actually out there and available on the internet and nuts have nothing better to do all day than spend time figuring out how to harass people who have real lives I am afraid.
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