C.
T.
I don't blame you for being concerned, after all your daughter's health and well being are your main priority. If I were in your position I don't think I'd let her go overnight at least not at her age. A good solution might be to start small. Let him take her for an hour or two. A trip to the park, children's museum, the zoo, something for him to do one on one with her. I'd personally leave overnight for later (closer to school age)so she be able to voice her concerns or worries to you in the event that something you deem inappropriate happens.
Best of luck with your lil girl
C.