Atishu arrives in Melbourne having had one start for the campaign, finishing seventh in the Group 2 Apollo Stakes (1400m) at Randwick on February 15.
Waller said the mare ran well first-up and had benefitted from the run.
"She ran behind Via Sistina and Fangirl and that day she drew wide, she got back and finished off nicely," Waller said.
"She's trained on really well since and has had a couple of gallops since back in Sydney.
"She loves Flemington and is a multiple Group 1 winner here. She loves the mile, so that's good timing, and then it will be on to the Australian Cup from there."
Waller said the Flemington circuit suited Atishu's style of racing where she can balance early.
"Flemington is a fantastic track. All horses get their chance," Waller said.
"It has a lovely, long straight, a sweeping bend and it's always a good surface, very consistent.
"Atishu relishes those sorts of conditions and track, and it suits her racing style. She likes to be left alone, build momentum and finish off strong.
"I think all tracks should strive to be like Flemington if we could get it 52 weeks of the year."