She might want to try a product called Zim's Crack Creme. It was originally formulated for use by cement workers, so you can imagine what their hands were like. Some people swear by it, but I tried it on my hands when my fingers used to split in the corners of my nails, and it didn't work all that great for me. Maybe I just didn't give it long enough to work. It's available at most of the big chain pharmacies.