 In January 2018, Deirdre finished fourth behind Soul Stirring, Mozu Katchan and Aerolithe in the polling for the JRA Award for Best Three-Year-Old Filly.In the official Japanese rankings she was rated level with Mozu Katchan, two pounds behind Soul Stirring who was the top-rated three-year-old filly.On her first run of 2018 Deirdre took on male opposition and came home sixth behind the four-year-old colt Clincher in the Grade 2 Kyoto Kinen over 2200 metres on 11 February.