Also, you might want to consider giving her the option to "freshen up" with moist wipes. This is a good alternative for alot of caregivers who cannot get their loved one to bathe, although it is a temporary solution.
When my grandmother was ill and did not want to get into the bath, we convinced her that using the moist wipes would help her skin to maintain its youthfullness because the wipes had aloe in them.
The wipes did work really well, they are disposable, and do not have alcohol in them so they do not sting dry skin.
The wipes can be purchased in bulk at: