Diamond is now 4 months old...I feed her a large breed puppy food but should I be giving her large breed treats too? Any ideas or suggestions?

Size specific treats are a gimmick, they're there to suck people in - they don't have a special need in the animal world. Any treats she really likes will be fine. Treats should consist of less than 10% of her daily intake anyways, so the amount of treats given really isn't even to affect anything negatively.