Pop queen Madonna has revealed daughter Lourdes has banned her from attending her university games. The 56-year-old "Material Girl" hitmaker to four kids- Lourdes, Mercy, Rocco and David. The 18-year-old Lourdes studies at the University of Michigan, which is also Madonna's alma matter. The singer said though she is a worried mother, she does keep her distance in order to have the spotlight on her daughter, reported Madonna. [related-post] "I'm very mom. I'm very, you know, worried. 'Are you OK? Are you getting enough sleep? Are you eating right?' You know, I set up a humidifier in her room with eucalyptus oil. I was worried about the fact that she didn't have enough towels, Q-tips, you know." Asked whether she visits the university, she replied "Of course" before admitting, "I'm not allowed at games. You think my daughter wants me at a game?"