The 23-year-old, who won Britain's 65th and final medal at the London 2012 Olympics last summer, finished 20 seconds clear of Eilidh Prise to win the senior and overall titles.
That also booked Murray a place on the British team for July's European Championships in Poland while second place saw 17-year-old Prise claimed the junior women's title.
In a high-quality women's field reigning individual world champion Mhairi Spence finished seventh and Olympic silver medallist from Beijing 2008 Heather Fell came home fifth.
And Murray admitted certain aspects of her performance were better than her opening World Cup event of 2013 in Rio last month where she finished fifth.
"I had a fantastic day," said Murray. "I was relaxed coming here and I wanted to win to secure my place at the European Championships.
"I started training again after the Olympics in January and I felt strong. My running has improved since the World Cup in Rio last month, when I finished fifth."
Meanwhile Joe Choong edged out Jamie Cooke in a sprint finish to win the overall men's title and with it his place on the British team for the European Championships.
The 17-year-old's performance also gave him the junior title while Cooke didn't leave empty handed as he won the senior title with Choong admitting to luck being on his side.
"I'm pleased, I like a sprint finish," said Choong. "I was a bit lucky because I got a really nice horse, and riding is my weakest event."
- Sports & Recreation