Topical products are nice but I would target the real cause of the dry skin by increasing her intake of Omegas and fatty acids.
I keep both of my boys on a product called Show Stopper which is a vitamin suppliment that is made from human grade ingredients.. Its the consistency of brown sugar and you add it to the food daily. Not only do they LOVE eating it but their coats look amazing.
There are some sites on the web that have all of the details on it.
Good luck!