LW's daughter needs to read this, wake up, and get her mother off her bank account. She's an adult now, and no longer needs an adult co-signer as she presumably did when she opened it.

As for "sex addiction", there's a reason it's mostly the fundigelical crowd who talks about it, and that reason is that they're the ones who invented it. And I'm not going to say all of those parents are controlling as heck but nevertheless, the sooner LW's daughter takes my sage advice, the better.