Side question. Did your daughter get the L720T version through a sprint store or online?, I ask because I am trying to get my sister the T version and will be going to a sprint store tomorrow.
Back to your question: I believe some members here were able to root with cf-auto root by chainfire. The one meant for the SPH-L720.
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http://xdaforums.com/showthread.php?t=2605659
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