I agree with the others about not adding yummies to the food -- the dog will refuse to eat without it if you train her to be that way. I know -- I've trained my dog to do that!
Since the dog seems bored with the current food, it's probably a good time to switch to another food. Sticking with the old one is just beating a dead horse. When there are so many good foods out there, why make it harder for yourself? Find a high-quality one she'll really like and follow the advice you've already been given. Pet feed stores often have sample bags of food you can try without buying a whole bag. Follow the instructions about slowly replacing the old food with the new over 2-3 weeks.
When it's time to eat, I would call the dog to eat, make sure you have her attention on the food, put it down for 20 minutes. If she doesn't eat, pick it up and feed it again at the next meal time. No treats in between. When you have her on a schedule where she's eating regularly again, you can slowly introduce treats back in, but never in relation to her meals.
Check with your vet again about the puppy food. We switched our husky/shepherd mix to adult food at around 8 months at the advice of our vet. And while you're at it, make sure there's nothing else going on with the dog that would put her off food. Our dog had stomach issues which is why she seemed like a picky eater. She had no other symptoms at first -- was very active and playful. But she got worse over time. Not saying your pup will. Just saying that if a food switch and the new regimen don't work, might be time to check out other reasons she won't eat.
Good luck and let us know how she's doing!
P.S. We learned the hard way to always give our dog her kibble first. Once she's eaten all or most of that, then she gets the canned. We feed her 2 cups of kibble 2x a day and 1 can of wet at dinner. If we gave her the canned first, she would turn her nose up at the kibble. A side benefit of not mixing them -- moistened kibble, esp. kibble with citric acid in it, has been associated with bloat. So I never wet the kibble or mix it with the canned for my larger dog. Her mother died of bloat so we're extra cautious.