Having her first start, the three-year-old showed good pace early, and despite running about in the straight held on well to defeat $2.90 favourite Don't Con A Con (Justin Stanley) by three-quarters-of-a-length with Sugared Almond ($4.40, Shane Arnold) a further head away in third.

Doyle, 24, has only had his licence for five months and learned his trade from fellow Muswellbrook trainers Neville Boyle and Jeff Engelbrecht.

"I've got four horses in work at the moment and this was only my second starter," Doyle said.

"I've leased the filly off (former jockey) Daniel Northey's mum and she has always showed a little bit of ability.

"You never know with horses having their first start but I thought if she jumped well she would be a chance and it worked out well."

Luck was also on Doyle's side before the race.

Kody Nestor had been down to ride Stop The Flow but couldn't make the weight, with the ride then going to champion hoop Greg Ryan.

"You need a bit of luck and Greg's not a bad bloke to be able to get when Kody couldn't get the weight," Doyle said.

"I might look at a 1000m race for her at Tamworth later this month, I'll just see how she pulls up."

While the breaks went Stop The Flow's way, the same couldn't be said for Don't Con A Con, which was having his first start for Orange trainer Peter Stanley.

The gelding was slow away and had to change course several times before hitting the line strongly to finish second, suggesting a win may not be too far away.