Chris Waller's decision to open a Queensland satellite stable has returned a reverse benefit for the champion trainer.

Waller sent Unforgotten to his Gold Coast base in July for some remedial work with stable manager Paul Shailer.

The advantage of Shailer's assistance was evident at Canterbury on Wednesday when Unforgotten won her maiden at the third attempt.

"It's been a good team effort. She's shown us promise and just showed she was a bit immature so we sent up to spell in Queensland," Waller said.

"She's done all her work with Paul Shailer at the Gold Coast and they didn't want to let her go.

"Fortunately we got her down here, she's a very talented horse."

Unforgotten, who was second to subsequent Group One winner Ace High at her previous start at Kembla Grange, swooped down the outside to win the Schweppes Handicap (1250m).

Sent out a $4 chance, Unforgotten pulled 2-1/4 lengths clear of the $1.90 favourite Poetic Charmer.

Waller said his only regret with Unforgotten was she had missed suitable black-type races over spring.

"She probably could have been up and going a little earlier but maybe she gets to Melbourne for Cup week," he said.

Unforgotten was the first leg of a Waller treble with I Am Serious and Best Guess also winning for Sydney's premier stable.