"She is not the biggest horse in commission but I'd rather have a small horse with plenty of heart than a big one with no heart," he said.
"She's very tough and she just thrives on hard work.
"She has done most of her racing in the South Island and was probably a little too fresh when she ran at Riccarton last month and she over-raced a touch because of it so I said to Vinnie I didn't mind where she was today but to just get her to settle.
"He rated her nicely in front and she was just too good in the end."
With a victory under her belt now, Rae believed there could be more in store for Diva Express over the next few months.
"The way she has gone today I think she could figure in some of those good winter two-year-old races that are coming up," he said.
"Something like the Ryder Stakes could be on the cards but we'll take her home and see how she does before we make any plans for her."
The Listed Ryder Stakes (1200m) will be run as the final two-year-old feature of the 2018-19 season at Otaki on July 27.