My own two cents - if it isn't for sale, try to find someone she is willing to sell it to and get them to buy it for you. Pay them a fee, buy it off them, after the sale is final.
Sounds to me like her mind is already made up!
Your problem is - you can only see today, you aren't looking at the future.
Your dad isn't going to live forever, nor is the neighbors.
What may look like prime territory to you - today, may be worthless - from a hunting standpoint - tomorrow.
I had a friend that was poor as a church mouse.
His wife's family owned 40 acres, and gave him 5 of those acres, right in the middle of the property.
His belief was that 5 acres was not enough land to do anything with, and he gave it to his worthless adopted son.
The adopted son sold the land to a group of hunters that wanted it for the purpose of hunting, or so they said.
They started out with a tent, then a camper, then built a large house.
In no time at all, it went from being a hunters paradise, where rabbits, grouse, deer, pheasants were a plenty, to a place where no one else in the whole family could no longer hunt - because the house created a situation where it turned all of the other property's into a safety zone around it..
I don't even look out the window of the truck anymore as I pass the gate and the mailbox.
Go someplace where there is lot's of land, like Potter or Cameron County and stake a claim on a piece of property, where after you build your camp, there will still be lot's of woods where you can go to hunt.
Take your friends, family members, children up to that camp as often as you possibly can.
Leave your POSTED signs at HOME!
Backyard hunting might be convienent, but not practical.
No memory is as deeply ingrained into my conscience as my memories of going to CAMP!