25 minutes is still a pretty fresh track. You might try an hour.
Serpentines, articles, circle track (they start and finish in the same location), more food, tire her out a bit before you track, longer and more corners. Make sure the track is the reward and not the end so if you are using food there should be a lot of food on the track and only a tiny ending pile for the finish.
Longer, harder tracks can help especially with experienced dogs, but they can also cause stress and fatigue making the dog faster or hectic.
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