Befuddle runs in the HKJC World Pool Trophy (1100m) on Saturday, her second start in 11 months.
Sadler explained the daughter of Hanseatic did not come up in the spring, but he was delighted with the filly's performance when fourth at Caulfield Heath on February 9 when resuming.
"For a horse that had been off the scene for a long time, she ran very well at Caulfield Heath," Sadler said.
"She got very tired late, but they did run along, and she led them up and there were some quick horses in that race.
"We got her to the trial stage in the spring, but she just didn't come up, so I tipped her out.
"There were no lameness issues or anything like that, she just didn't look right.