The championship converged on Devon for round three of the series where 34 women and girls entered the well-organised event, hosted by the Torridge Motorcycle Club.
Bristow made the 670-mile round trip a worthwhile one by taking a clear win, with a score of 24 – nearly half that of the second-placed rider, on 43.
“It’s been a long weekend of driving, but winning always makes the traffic on the journey home more bearable,” she said.
“I have enjoyed the trial and thought the organisers had put a lot of effort into making some challenging sections, so thanks to the club.
“My main focus is to be prepared for the World Championships, starting next month, so I’ve been working hard and I’m feeling strong on the bike.
“On the whole I’m happy with my riding and excited about the rest of the season.”