If she does turn out to be deaf, there are wonderful ways to train a deaf dog. First of all, dogs learn visually better than they do by verbal means. People are often amazed at how their dogs understand their hand signals better than their verbal ones. What is actually amazing is that they do understand our verbal cues at all. LOL. Hands signals and body language is right up their alley. So, all you need to do with a deaf dog is get his attention by a special vibrating color or a light or other vibration source. Once your puppy learns to look at you when he feels the vibration or sees the special light (because looking at you will be extremely rewarding)....then all he has to do is watch your hand siganl. Of course, these things need to be taught just the same as any dog needs to be taught. Classical conditioning training, using a marker, (which in the case of a deaf dog will not be a sound, but will be a light or virbration) which marks the correct behavior, and then a reward follows immediately will be most effective. You'll need to find a book or website which will instruct you.
But don't jump to conclusions. Your puppy may not be deaf at all, but seriously under motivated. If he is lying down, resting and doesn't know you're behind him, and you whistle or speak,(different pitches and volume) does he not flinch an ear? (excluding the possibility of blowing air on him when you whistle) Have you tried different sounds which do not cause vibrations, such as stomping your feet would? But your best bet, if you suspect deafness, is to take your dog for a vet exam. Let us know.