Oh, here's another thing that would help her.
I wish some guy had hit spin serves to me when I was a 3.0. Most women don't serve with a lot of spin, so I am not used to seeing it. If you can hit big kickers and twist serves and slices to your gal, she will develop the skill of being able to read the spin better.
Maybe when she gets to 4.0 she won't be as easy to ace as I am!
-- Random Error Generator, Version 4.0
-- Master Moonballer