Sicari had her best placing at the World Cross Country Championships in 2005, placing 40th in the long race. She was runner-up at the Stramilano half marathon in April, setting a personal best of 1:12:39 minutes behind Anikó Kálovics. She was selected to compete on the track at the 2005 Mediterranean Games and she was sixth over 10,000 m. She also represented Italy at the World Half Marathon and the European Cross Country Championships that year.