I would like to suggestthat after carefully measuring, drop down 1" (or more) to the next shorter draw length. Reason(s) . . . If she's going to use a release, you want the shorter length so your anchor point is not too far back. Maybe more importantly, the arrows will be shorter which stiffens the "spine" of the arrows and for me at least, made a huge difference in shooting accuracy.
A N D . . . The shorter draw length will create a natural "flex" in her bow arm which will help prevent the string hitting her arm/wrist, and promotes good form.