Perales competed at four Paralympic Games: the 2000 Summer Paralympics, 2004 Summer Paralympics, 2008 Summer Paralympics and 2012 Summer Paralympics. She won her first medals at the 2000 Summer Paralympics, earning a bronze in the 100 and 200 m. freestyle, bronze in the 50 m. backstroke and 50 m. freestyle, and a silver in the 50 m. butterfly. The only events for which she failed to make the podium were the 20 point relays in the Medley Relay 4 x 50 and 4 x 50 Freestyle Relay events, in which her teams finished seventh and fifth respectively.