It's hard to give gift ideas when I don't know what she has...

I'd probably go for stuff like:

Silicon baking pans
Silicon oven mits
Baking spice kit from Penzys
"I'm just here for the food vol2, baking" by Alton Brown (Depends on how geeky she is. Alton Brown really gets into the nuts and bolts of recipes, and why stuff does what)
Kitchen scale (Bake by weight, not volume)
cake dolly (for decorating. It's like a lazy susan for cakes)

-Stout