have your daughter hook up with PT that is able to evaluate her bio mechanics specifically with joint loading ie jump, landing , push off. I assume she is well healed and repair is good. Meaning that the knee does not have too much slop (movement forward and back when testing the ACL). It is not uncommon to suffer other injuries as one gets back to sport, it is unfortunate and the athlete has to remember what the body can do now and slowly build to what it was capable of before the injury, over the course of the next year or so. Also, it is not uncommon for the the uninjured side to suffer. I hope the back to back ACL's were not the same leg. That would suck! Anyway, encourage your daughter to stick with it! Seek the help of a qualified PT, not one who is just following an MD protocol but one who is looking closely at her mechanics and is looking at the way she moves not only at the knee but hips and ankle as well. good luck to both of you