8 month old standard no longer likes her food

What have you found that your poodle likes to eat? I have been feeding her the Costco puppy food and she snubs it. I tried some expensive sensitive tummy food and she’s not into that either. She’s SO picky! Even trying to train her it’s hard to find treats she likes. I tried mixing in other things like chicken and she’d eat a little of it but that’s it.