hmm, i'd say depends on her tastes, and depends on what your price range is, but if it were me...

~$100-300
- dc cai or injen sri
- aluminum interior trim kit
- different shift knob/boot + short shifter

~$400
- xenondepot HID kit
- oem spoiler/jdm itr spoiler

~$800-1000+
- oem bodykit, maybe CF hood + greddy lip or somethin
- set of wheels based on what she likes