Of course she DID...

Page Six claims Madonna knew all about her brother's scandalous tell-all and even helped him write some of it. A source said, "She actually ghost-wrote parts of it with him, the way Princess Diana helped Andrew Morton write his book on her. That's why there's nothing too devastating in Chris's book. He's mean to others, but not so much to his sister."
The tell-all is all part of Madonna's publicity blitz to promote her "Sticky & Sweet" tour. Another source said that she is using the A-Rod scandal to her advantage and will wear a Yankee jersey in the finale of her show. The source said, "All of this was created to sell tickets for her tour, which hasn't been selling so well."