What is a good body wash for an elderly lady with extremely dry skin?

Anything mild and moisturizing. Soap or "body wash" is really only necessary on the axilla (armpit areas) perineal areas (groin area or "between the legs") and the feet. Unless there is visible dirt, she doesnt need to use soap directly to her arms and legs, belly shoulder etc. Just washing with water (and some of the soap will run over these areas as she rinses) I tell elderly people and people with very dry skin to just use soap on "the stinky parts" and just bathe with plain water on the rest. They will come clean and be refreshed by doing this and it is a lot easier on their skin. Avoid using very hot water when bathing. Use tepid in Summer and just warm enough to be comfortable in Winter (not hot water) because if the water is too hot, it strips oils away from the skin. As soon as she gets out of the bath or shower, she should pat her skin dry and then apply body oil or lotion to help the skin retain the moisture. She should towel dry just until the skin is slightly damp then apply the oil or moisturizer to help the skin retain the moisture from bathing. Do not apply oil or lotion to the feet in the slippery bathroom. If she needs moisturizer on her feet, she needs to apply socks over the moisturizer so she doesnt fall! Lotion and oils shouldnt be used between the toes either, especially if she is Diabetic because this moisture there will encourage fungal growth so only apply to the tops and bottoms of feet, not between the toes. Hope this helps!