Here's an idea that other people probably would not think of: essentials for the wedding day. She will thank you for helping her by pass all the little mishaps during the day. Included in the kit are: toothbrush, toothpaste, dental floss, mints, drinking straw (absolutely essential!), pain reliever, antacid (right after lunch and before the ceremony), mending kit (yes, the train can get battered), safety pins, stain remove (absolutely, positively, necessary especially after the photos and before the ceremony) and many more... Available at Mr&Mrs.com.
Occasion: Wedding Day, Bridal Shower
Other fun ideas:
What Happy Women Know/Rachael Ray Cookbook
Clarisonic Skin Care System
Brown Sugar Body Polish
Working Girl Survival Kit
Honey Bee Gift Box