Samantha Rose built on her Portsmouth success with a superb performance in the Dambuster Standard Distance Triathlon at Rutland Water Park.
The event is hotly contested because it is the last chance to qualify for the Great Britain team for the ITU World Age Group Championships.
Rose finished in third place overall in Leicestershire and second in her age group (25-29).
That was enough to guarantee her a spot at the worlds in Chicago, USA in September.
Experienced full-time triathlete Samantha Warriner won the race, with Great Britain regular Lucy Nell in second place.
For Rose, who is from Portsmouth, it was another very good performance after winning her home event in Southsea a week earlier.
She said: ‘There was a tough field of competitors, among them Samantha Warriner, who is a previous ITU World Cup champion and full-time professional middle-distance triathlete. She won the female race overall, followed by my friend and swimming training partner, Lucy Nell – a fantastic triathlete.
‘I finished third woman overall, which I was thrilled with, and second to Lucy in our age group meaning I have qualified to represent GB, in the 25-29 age group in Chicago in September.’
Rose completed the race in a time of 2hr 14min 22sec.
She finished the 1,500m swim with an excellent time of 20.10.
Then after a quick 50-second transition she was out on the bike leg – a slightly long, undulating, 42k with the Rutland Ripple among the difficult hills to negotiate on the way.
Rose completed the course in a time of 1.11.54 and after a 42-second transition, she finished the 10k run with a 40.46 clocking.
Warriner’s winning time was 2.07.45, with Nell second in 2.11.42.
There were 163 female competitors in a total of 754 finishers.