I heard that one of the hardest things for Mormons and JWs to leave their groups is because they are so connected to it. When the kids sometimes run away from home (apparently there are some Mormon groups with compounds that have an aversion to sons because they want more women to marry with), they don't know anyone in the outside world!!
What I mean is that you probably should keep this friend.
yes, I spoke with a past witness convert at Church, and she explained that JW's are not permitted to do ANYTHING religous with people of other, non JW faiths, unless it's trying to convert them. ahd the whole story about the kids running away and not knowing anyone, that's EXACTLY why JW's and Mormons are cults.