Being a father of 2, I'm more interested in the well-being of the child instead of the he-said she-said stuff.
However, I am concerned about OP's changes in how she views the problem within this very thread. Earlier she said she's with her daughter 24/7 and she turns away from time and fun activities with mom to do her business, and then later says the girl is begging for attention from mom and is not compulsive to justify not taking further steps. This concerns me because it sounds like OP is justifying not opening a potentially very ugly door. This is understandable - this is not an easy thing. Nonetheless, for the well-being of the child, she should visit a professional who is expert in sex abuse issues.
If there truly is nothing going on, it's case closed and they move on. Speaking for myself as a parent, I would want to be absolutely sure. My daughter had difficult issues of a very different but also potentially traumatic nature when she was young. We dealt with it and she's better off for it, being a vibrant and creative girl. The monsters of the world count on people taking the path of least resistance. It keeps them in business.
You posted about this because something deep in your mind was bothering you about this. Somewhere inside you sensed something was wrong, but you're looking for confirmation that it's all right, that it's just the sling or something innocuous. I'm not letting you off the hook. Don't turn a blind eye - follow your gut, which was right all along. If I'm wrong, you can crow about it. The stakes are too big to let it go. Be strong - you can do it. Please.