A Scott 'itty bitty goose. What colors is she into? Do you think the bow will be camo or a target color or black? Us girls have to match everything lol! You could get a custom sling as one of the accessories. I use CNC slings http://www.cncslings.com/
Or maybe a nice quiver. If you want to get target arrows that would depend on what kind of target shooting she wants to do. Will she be entering competitions? Then will she be doing indoor, 3D or what? I shoot different arrows depending on what season it is. Right now is indoor season and most people are shooting fat arrows like Gold Tip xxx's. Also, arrows are not very cheap if you get the high end ones. You may be able to find some used ones. Then you could get some custom wraps and fletchings and make them whatever your heart desires. I know it depends on what brand of bow she gets, but if you have a good idea you could go to that companies website and look what they might have for shirts and jackets or hats and other accessories with their logo on it.
Another idea would be a nice stabilizer. You can also find wraps for them to be customized. I use Dead Center products http://deadcenterarchery.com/
They have very good products at a good price and the customer service is very good. If she is going to shoot bowhunter then you can get the bare minimum and stay in your budget.