CNN VideoWACO, Texas (CNN) - A weekend swim left a young girl fighting for her life when she contracted a brain-eating amoeba with a 97% fatality rate. The 10-year-old girl swam in the Brazos River and Lake Whitney in Bosque County near Waco over Labor Day weekend, according to CNN affiliate KWTX-TV. Then, on September 8, the girl "began having a headache, and it was quickly followed by a fever," according to a Facebook page created to support the girl. "It's every parent's worst nightmare," the girl's aunt, Crystal Warren, told KWTX Friday. Warren told KWTX she's hopeful her niece "will be number five to survive."