I don't doubt she does, but she doesn't adhere to the Book of Concord so she can't be. As far as bringing people to Christ, with her 'beliefs', one has to ask, "Which Christ?"
And I was pleasantly surprised to see how respectfully NPR treated her. Bolz-Weber pushed no “liberation theology” in her interview, and she strongly came out as a follower of Christ. And NPR accepted all that without any smarmy comments.