I have no idea what the Quest is like, but the Infinite Edge is a super nice shooting bow. If she can pull 50# though... and doesn't need a bow to "grow" with her, there are better choices, particularly, in my opinion, due to the "soft wall" these highly adjustable bows have. There is nothing like having a hard wall to pull against...
But honestly, my daughter shot the Diamond... at 23 inches and 20#... and LOVED it... then the tech changed it to 28 inches and 55 pounds and I LOVED it...
Good Luck!