What tempature is the water? I CANT shower in cold water, I mean I like it about 150-170F. It feels so much more conferbal. Try changing the water temperature, ask her if she likes it more.
If I could I would shower for hours and meany times a day, but I find it the most relaxing place in the world. If she has music she likes let her bring a stareo in there and play it while she showers.