Play the tape for your daughter. She has a right to know. Having secrets like that kept from me when I was young only bred a sense of resenment for those who should have informed me at the time. Kids are not as mature, but as in "Catcher in the Rye", there comes a point where you just have to let the child grab for that brass ring. You cannot protect them from everything, and trying to shelter them from all things that are ugly in the world may simply backfire, causing her to be ill-equipped to cope with larger issues as they arise unexpectedly. As I said, they're not adults, but they are not invalids, either. I know you know this, so let her see the truth.