"It was a very good win last start and her work has been excellent since," Ken Kelso said.
"She has improved and I am as happy as I can be heading into a Group One race."
The trip to Wellington holds no fears for Kelso and his temperamental mare, but he is hoping the rain stays away.
"She has had a trip to Wellington previously and won over the course and distance. I don't want to see the track deteriorate (currently a Dead 4) too much as there is a bit of rain forecast. I think so long as it is no worse than a Dead 6, she should be fine. She does like the firmer surfaces and really bounces off it."
A granddaughter of champion mare Ethereal, Supera is raced by Sir Peter Vela and was bred by his Pencarrow Stud.
"She hasn't always been easy as she can be head-strong, but we just work around her," Kelso said.
"We have an excellent girl that rides her in the mornings and we just work with the horse. If she was a maiden or a Rating 65 horse, you wouldn't put up with it, but she is a horse with terrific ability."
Kelso said safely through tomorrow's exertions Supera was likely to contest the Gr.1 Cambridge Stud Zabeel Classic (2000m) at Ellerslie on Boxing Day.
"We will just take it a race at a time, but the Zabeel Classic and the Herbie Dyke (Gr.1, 2000m) are on the radar, but we will get Saturday out of the way first," he said. – NZ Racing Desk