And why should she? Living in an RV park means a never-ending supply of patsies who will take pity on her and give her free meals and an occasional pat on the head. All she has to do is mew and purr and rub against a leg - and voila! Free meal! Why be domesticated when being "free" is so much better? But of course, a cat isn't making that mental calculation - or is she?
Not every cat wants a warm lap to sit on, or a warm fireplace to curl up next to and nap - not when living on the street can be not only comfortable, but leave you with a sense of freedom and lack of obligation to anyone. And while dogs are more like pack animals - and want to bond with humans more than cats do - they will wander off their leash at the first opportunity and end up lost. They just aren't that smart.