I had a girlfriend after high school who I tried a hairjob with once, and it was a letdown because her hair was so dry.

If she's into it, cumming on her hair would probably help. Otherwise, the hair care aisle at your lacal drug store is full of conditioners for dry and damaged hair. Finally, what's she eating? Is she getting enough protein and high quality fat in her diet so her hair grows healthy?

Good luck to you, combrade!