Puppies go through growth spurts, and at some periods they grow faster and some periods the growth plateaus. You can't go by 3 pounds a week. You have to go by her overall condition. If she is still hungry, feed her more.
Your pup is at a high growth stage. I am not familiar with Orijen, save to know it is grain free, sourced in Canada, and expensive, good food. I do not know whether it is particularly well suited to puppies at this stage, especially one that is already small and thin. Yes, go directly to adult food, but grain-frees are not all well-suited to puppies.
Also if the bag says feed x per pound, or for dogs at 11 pounds feed 1 1/ to 1 1/2, that usually does not mean puppies. Puppies are eating for growth and can eat considerably more than adults. I would up her to 2 cups a day to start and give her a week and re-evaluate her condition. It may not be enough.
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