A 15-year-old girl identified as Kaylee Gain has been fighting for her life after her head was repeatedly bashed into the concrete during a brutal school fight near Hazelwood East High School in St. Louis County, Missouri last week. She has suffered major brain bleeding in addition to swelling and remains in critical condition, according to the person who launched a GoFundMe on behalf of her family to help cover medical costs, RadarOnline.com has learned. “She was admitted to one of the local hospitals in Saint Louis with a skull fracture and frontal lobe damage,” the fundraiser noted. Disturb…