I think she says something to the effect of "I don't need to use the bathhouse because I have a bath at home". So take a bath at home. On the next day you try to take a bath it will...I dunno, break? And then you get to bath with all the poor people at the bathhouse.How do you get into the hotspring? I kept trying to get in there almost every night and day, but she just kept refusing to go in the building until I got to the bad end with the final boss. I know there must be a way because there's scenes in there.