My tiny girl Zoey is the same way! She's 6.5 months now and I still haven't even found food she will eat on a consistent basis and I've tried EVERYTHING (kibble (all brands), wet, raw, and home-cooked). She is extremely picky and even with treats. I've tried literally everything. Zukes (all flavors), Wellness Puppy Treats, Veggies, Fruits, The Kong, Peanut butter, Treat Ball Treats, Biscuit treats, Cheerios.. you name it and she turns her nose up at it all. The only thing I've found that she loves is something called Coco Therapy - The Coconut Oil and Coconut Chips! She goes crazy over both and it's really good for dogs. I think there is a member on YT that sells both, but can't remember who it is. Here's a link though were you can read more about both and order.
http://www.cocotherapy.com/