That is just terrible - it means that they put your D in the position that she had to lie or omit the truth to you about what was going on, too. What a nasty position to put a child in...
As for your issue of faith, you can just keep repeating to her that people are fallible...God gave each of us the option to CHOOSE our own path. In the end, it comes down to each of us which path that will be.
