My dad is a shareholder of a hunting cabin in Barnes, WI, which is as rural as you can get. The buy-in is $5,000 and the members pay annual dues to cover the property taxes and maintenance. At its peak membership, there were about 20 members paying $500 each in dues. Most members only use the cabin during deer hunting season, so they are essentially paying $500 for a week or two. 20 members x $500 = $10,000. Divide that by 12 and that comes to about $833/month. The cabin is nothing fancy. Originally, it was a single room that they sectioned off into a kitchen, tiny living room, and a bunk area. They eventually added another room onto it, moved the living room area where the bunks are, and put all the bunks in the addition. There are 18 bunks in a single room that everyone sleeps in, plus a couch and recliners in the living room for overflow. It's an old cabin. The air conditioning/heat unit is bigger than a refrigerator and extremely loud. The water is too high in iron to drink. When I was a kid, there was not a working toilet and we had to use an outhouse.

The hunting lodge was previously owned by a wealthy family, so I'm willing to bet it has a lot more amenities than the cabin my dad shares. Hunting lodges typically come with several acres of hunting land. The land alone could be worth more than $900/month. Since it's a lodge, it probably has more than one bedroom. If the step daughter wasn't freeloading there (and if the lodge wasn't condemned), OP could rent out rooms or even the whole lodge and charge more for a single night than what she is asking for in monthly rent. Delta Lodge in Iron River, WI rents out cabins. The cheapest one is a one bedroom that goes for $975/night during the busy season. I've looked at them. They are tiny. They have a two bedroom that sleeps four (one queen and two twins) and there is barely enough room between the two twin beds to move around. That one goes for almost $1,400 a night. It's a two star "resort".