Well the first time she goes back is an accident and she doesn't know how to return. Afterwards it is because of love/friendship/sense of responsibility because by then she knows the people there and no matter how much she argues with InuYasha she likes him (well, clearly)
Not to be rude, but I sincerely doubt anyone would give you something when they don't know the individual or the circumstances. If you really want one, you can search for deals through xbox live. If you're too young to pay for one yourself and your parents do not want to get one for you, then I...