I would suggest you enroll your puppies in obedience classes. They will teach you how to teach the puppies.
Use food to lure her into a down from a sit. Puppy is sitting...hold a treat in front of her nose and lure it to the ground in front of her...while saying "down". Praise and treat.
Use something really good like a tiny slice of hot dog, or string cheese or cooked chicken or roast beef.
Classes are a must for your dogs...you have two puppies!
Gina