You know, I can see this happening.
The "grey water" (kitchen, shower, sink) can generally just be dumped outside/used to water plants, as it doesn't contain any pathogens. If they have an outhouse (or install a composting toilet) they'll just need to replenish the water supply periodically, and there are bulk water delivery services in Flag that can do that. At least until the neighbors complain.
Electric would be a problem, but I suspect solar panels would help with that quite a bit, and she can use propane heat in the winter.
(Disclaimer: I live in a 26' RV (although mine i