I based my answer on this:
Entering my property in my book says trespassing. I'm referring to calling a bluff on the photographer. From what I can tell, they want their name and address off her website.
You are basing your comments on the dictionary definition of trespassing, though, and not on the legal definition. Under the law in Minnesota, entering onto or crossing over another's property without permission or right is not trespassing unless "No Trespassing" signs have been posted. The photographer appears to have done nothing illegal by taking photographs of the barn, even if he crossed country girl's property to do so.
Because the police cannot do anything about legal acts, there is no reason to file a police report. Nothing can come from it. The photographer would know this because the police would tell the photographer this. And this is assuming the photographer was not aware of the law already. If the photographer is a professional photographer, s/he could already know the law.
I personally would not want to have my name and property address listed on a website so tour groups could visit and gawk but there is nothing illegal about listing the location, or the names of the property owners, or about organizing a tour to visit the property and view it from a public road. As I mentioned earlier, celebrities have to put up with this if their homes are listed on a celebrity tour. Many have gone the route you suggested (the high fences and plantings) which works to preserve privacy to some extent.
But there is nothing illegal in Minnesota, apparently, about crossing UN-posted property to view a barn (peeking through or taking pictures through the windows of an occupied building, on the other hand, could cause some legal grief for the peeker-photographer).
Posting the property would at least eliminate those wanting to take a closer look at the barn (or, if someone were to enter onto or cross over the posted property despite the signs, country girl would have good reason to call the police over the trespass).