"He said to me over a drink 'every dog has its day'. I said 'are you calling Molly (Classic Moet) a dog, and he said no - you'.
"It was a silly little moment, he was right, sometimes it is just meant to be and certainly today was our day."
Price said it would take another 24 hours for the win, the first big one of her career, to sink in.
Her British-bred horse is winning wide recognition as a cross country legend.
Second-placed Oliver Townend said: "I hope the public understands what that horse is. I don't think we'll see another cross country galloper like it in our lifetime.
"I couldn't keep up with it in the prize giving – it was about ten strides ahead of me, I looked down for a moment, and when I looked back up it was on the other side of the arena! I'd give anything for a foal out of it."
The Price website contains a hilarious description of the horse.
"Molly would, if she were a person, come from Swindon (or West Auckland for our NZ followers), be a couple of stone overweight, have several tattoos, wear a too-tight leather jacket over skintight leopard skin pants, have a boyfriend with an IQ of 10 who is a club bouncer, and four children by four different fathers."
"Molly is a legend but a kind of rock and roll one like Mick Jagger as opposed to the Princess type!"
Price told the Radio Sport Breakfast: "The mare I rode is a phenomenal cross country horse, genuinely one of the world's best.
"It's a bit like a triathlete. Her strength is not showjumping.
"It is the first clear round she's jumped on final day for years. Despite rattling a few poles, despite the nervous moments for all those watching, it was a really good round.
"Someone said I earned luck yesterday and used it today.
"We were a bit lucky today — that's sport. On the whole she put in a fantastic performance this week."
