I had originally written a long post explaining the situation but realise that it disclosed too much so I didn't post in the end.
I think my adult DD might be in a cult. Not the sort that normally springs to mind, but a more innocuous group (not related to a religion). The goup enjoy a common pursuit- for most people this pursuit is recreational and is very mainstream.
I am nervous about putting more (I've edited this twice already!) but want to make contact with anyone who has had experience of groups that take over a person's life.