It was an emotional win for Melham, who lost her grandfather not long after the Caulfield Cup and although Half Yours' winning margin was 2-3/4 lengths, she is convinced he played a part in the win from above.
"I have to mention my grandpa, he died last week," Melham said.
"The last thing he watched was the Caulfield Cup but he was such a big supporter of mine.
"He was up there opening those gaps for me, because I needed a few gaps opened."
Melham shared a special moment with husband Ben Melham, who rode Smokin' Romans in the race, and could not believe how the race played out for her.
"I said, 'I rode it how you told me to'," she said of the brief post-race chat.
"We don't normally talk racing much, but we went through this race about 10-15 times yesterday and that's exactly what I wanted to happen.
"It's not normal that what you want to happen happens, in these big races there's so many good chances, so many chances and all you need to do is give them a good ride."