I would agree that you're going to get good bang for the buck out of a Beman shaft. I would however recommend getting the total weight up and for that I'd say a 125 grain head is going to both add weight and increase the FOC for better penetration at her lower draw weight. Lancaster has some pre-Nano Axis or SuperSlim shafts on sale in the .500 spine right now.
http://www.lancasterarchery.com/inde...th=38_79_65_88