Mom insists on showering almost daily, even though it exhausts her and causes great pain. Any suggestions?

My mother has very bad osteoporosis, and has had several surgeries. She is on pain medication, and this September fell and broke her hip. She cannot stand for more than 2 minutes without severe pain, and needs a walker at all times. She tires extremely easily, and usually takes at least one nap a day (2-3 hrs). The most exhausting thing that she does all day is take a shower (she does have a seat in her shower, and uses it). I have suggested to her that she use the baby wipes in between regular showers, or just do a sponge bath, but she is resisting. She has always been very put together, so I understand this is difficult for her, but by the time she finishes with her shower, she is too exhausted and hurting to go anywhere anyway, so I don't see the point. Any suggestions?