The headline achievements are hard to ignore. Top-level wins at Doncaster, Kelso and Perth — three very different tracks with very different demands — suggest this isn't a trainer who stumbles into the big occasions. She's won at the highest level in December mud, a spring afternoon in the Scottish Borders, and at Perth in April, and she's done it across 45 career winners in just four years. That's a solid, purposeful body of work.
This season has been quieter, with 8 winners from 77 runners — roughly 1 in every 10 — compared to nearly 1 in every 5 last year. That's a dip worth noting, though a single good run of form can shift those numbers quickly at this level. What hasn't changed is where she tends to thrive: on normal ground she wins about 1 in every 6 races (3 from 19), and at Newcastle she's sent out 3 winners from 18 runners, which is the kind of record that suggests she knows exactly how to prepare a horse for that track.
Her most consistent jockey partnership is with Jamie Hamilton, who has ridden to 4 wins from 30 races together — roughly 1 in every 8 rides. That's a productive combination built over real mileage. The partnership with Gaelic Rover has produced 1 win from 6 races, which on paper looks modest, but a trainer who keeps returning to a horse in top-level company clearly believes there's more to come.
Jefferson is still early in her career, and four top-level wins before most trainers have found their rhythm is a genuine signal. The current season may look like a step back in the numbers, but the big-race pedigree is already there.
| Course | Races | Wins | Win rate |
|---|---|---|---|
| Newcastle | 18 | 3 | 16.7% |
| Kelso | 13 | 1 | 7.7% |
| Ayr | 7 | 0 | 0% |
| Doncaster | 6 | 1 | 16.7% |
| Sedgefield | 4 | 1 | 25% |
| Perth | 4 | 1 | 25% |
| Southwell | 4 | 0 | 0% |
| Uttoxeter | 3 | 1 | 33.3% |
| Market Rasen | 3 | 0 | 0% |
| Cartmel | 2 | 0 | 0% |
| Aintree | 2 | 0 | 0% |
| Haydock Park | 2 | 0 | 0% |
| Catterick Bridge | 2 | 0 | 0% |
| Musselburgh | 2 | 0 | 0% |
| Wetherby | 2 | 0 | 0% |
| Hexham | 1 | 0 | 0% |
| Worcester | 1 | 0 | 0% |
| Cheltenham | 1 | 0 | 0% |