My fiance shoots a Hoyt Selena at 52#, and I have her shooting the Magnus Stinger 85gr. I wanted her to have a cut on contact head with her lower poundage and K.E. The Stingers fly great for her perhaps it's a thought for your woman.
I am 47# Bowtech Equalizer. I shoot Montec G5 85gr. Shot my first doe couple weeks ago clean pass through. Like the way they cut ..
Ibelieve a heavier head would give better penetration when there is not much to spare in momentum. I'd also look to a COC.