Well, the bow seems to be about what she could draw. so... the string, just wing it, i use my thumbs up method, if its too high i lower it, if its too low i raise it.(thumbs up is doing a thumbs up and placing the base of your fist on the bow handle and the thumb should touch the string.) over all i suggest getting a wrist guard for her since i have a high brace height bow and its got tons of string slap, yet with a bow with low brace height same thing happens to me. i think that i would have just made it all red oak if i were you, its not hard to do when its 3/4" thick. But in any case the bow is done, i think ash is a tension wood, i would have flipped the sides around because so far i have not seen oak have problems with compression at lower weights.