I don't think its necessary to have any additional motivator at the end of the track if the dog enjoys tracking itself, especially if the dog doesn't particularly enjoy the reward that you're offering anyway. If you are pleased with her tracking behavior, why not just expand your criteria? Add length to the track, start picking up more food, age it longer, etc.
I have personally known some dogs who have learned to rush to the end of the track to get to a "jackpot" or higher value reward, and I chose not to do so myself for my current dog.
Feuergarten German Shepherds
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