"She had a little freshen-up and then ran well again when third behind By Choice and then, again, we we're happy with her run on Saturday when things probably didn't quite go to plan.
"So, this is a race we've targeted. We're under no illusion, but if there's a few chinks in the armours of the top picks then she might be a good top three chance."
Tigroni, a daughter of Tiger Of Malay who cost $85,000 at last year's sales, is a $41 chance and the most fancied of the three in the running for the bonus, which offers $100,000 for the second horse home and $50,000 for third.
The others, Leaves Of Lorien and Inhabit, are both at big odds.
While Charlton knows Tigroni needs a few things to go her way in a race dominated by the Bjorn Baker-trained Warwoven, he considers Getafix firmly in contention in the $2 million Magic Millions Cup.
The 1400 metre race became a target once the stable abandoned plans to head to the $10 million Golden Eagle.