Olympic gold-winning US gymnast Mary Lou Retton is currently battling a rare form of pneumonia in intensive care.The 55-year-old retired sportsperson's daughter, McKenna Kelley, shared that her mum is currently "fighting for her life" and "unable to breathe on her own" in hospital. She's also launched a fundraiser to help pay for Mary Lou's medical treatment because she doesn't have life insurance. McKenna posted on fundraising site Spotfund, "My amazing mom, Mary Lou, has a very rare form of pneumonia and is fighting for her life.