I agree with davan. You shouldn't introduce plyos until she has adequate strength. The shock from plyos can cause more damage than good if the strength isn't already there.
Actually, this is kind of a fallacy. Medium to high volume low intensity plyos like jumping rope, hopskotch, and skipping are much needed in the early ages as they help general athletic skill through increased motor control and learning giving kids better balance, coordination, and quickness while providing some fun and aerobic fitness from shear volume. There are many other benefits, but this is done a lot less now than I was in school and it shows in the general school population from 6-12 grades.