I would NOT ignore the situation, as it sounds like she is in a funk and needs to get out. Telling you about wanting to go home may have been her way of reaching out to someone, whether consciously or otherwise. Also, is she an adult or a juvenile? I would simply tell her that you are fine with her leaving, but until she does she needs to start helping you out with household chores. Furthermore, if she want to go home she has got to figure out how to get there on her own, as you are not going to foot the bill because she made the "mistake" of moving to WI. Was she running from something back in NH? Maybe whatever it was is eating at her now and she is wishing that she had just dealt with it. The next thing that I would do is give her the support and encouragement that is necessary to get her onto a normal sleep schedule and get her hanging out outside of the house. Humans are very social animals - we evolved that way as a way to protect ourselves from predators on the African plains. As a result we evolved emotions, which are what help us feel connected to others, and these connections are necessary for us to maintain a healthy mental state. Sounds like you may have a bit of work on your hands but nothing that cannot be figured out within your household (i.e. without the help of a mental health professional).