Something in a 500 spine, if you want carbon. Say an ST EXCEL 500 would fit the bill very well. There are much higher quality arrows out there, but these are good arrows.

If aluminum is your game, a Easton 1916 would be good. Congrats on the purchase, she'll be hitting bullseyes in no time at all! Welcome to the forums as well, let us know what bow you get when you do.