Think of it: you’ll rarely see hunting, agility, Frisbee, or law enforcement dogs being offered food rewards during training or job performance.
Are they joking? I train in agility and I see an awful lot of treats used during training. Not every dog wants to work for a ball or a game of tug. Yet even though I use tons of treats in my training, I can still take my dog out to a trial and run her around a course with no treats.
Likewise, if she gets something right, instead of erupting with shrill pomp, just calmly praise her, smile, then move on.
This whole section banks on all dogs being alike. That acting super excited will take your dog over the top. Try training a low drive dog in agility. You NEED to act super excited for everything they do.