I think the Genesis arrows are about 1813 Easton's or similar.
Lightnings will work, but use at least a 125 gr head to reduce the dynamic spine.
If she competes in the Genesis school programs, I believe they only allow the Genesis arrows.
PSE X-weave 100's are light spined too, use 125gr points or heavier and keep the carbon shafts longer. ICS Jr 28" arrows are good too, but stiffer than those mentioned (rated up to 45#) but I shoot them in 35-50# bow using 125gr heads and 4" feathers -they work best with at 40-45# bow, however.