Tom, for me when I get into one of those phases I do things that make me happy. During the summer swimming is a big deal to me because it gets me out and enjoying something that I enjoy doing. Also bike riding is something that I enjoy. During the winter months it is reading a book or going some place that just makes me happy. It is difficult sometimes because when I get really low I don't want to do anything but a reaction requires a action to get out of it.

Maybe taking her out to a nice restruant or buying her a new outfit or taking her some place that you haven't before. You could get her a sketch book and some paints and let her express herself that way.

Hope this helps.