Hey Brian,
Might give some good thought to what SpikeMaster mentioned.
With that said... My girlfriend shoots a 45# Red Wing Hunter. Her draw length is just short of 24" so she shoots a 26" arrow (goldtip 3555). The bow is a little stiff for her, not more than she can handle, but stiff. If she were to drop down to a 40# bow, with her draw length, she would not meet the 40# minimum weight limit to be legal.
We tried 125 grain, 150 grain and heavier target and hunting points, but what flew the best and more importantly what she shot most accuratly with, were 100 grain points.
I had to look long and hard to find a broadhead with a cutting diameter she was happy with, and settled on a Magnus. Granted, the arrow is a little light, but right now she only hunts small game and turkeys with her bow. When she decides she is ready for deer, we will have to make some upward adjustments to her arrow weight.
Pretty cool that your gal is shooting a bow at that age.
OkKeith