I am sorry to hear you are worried about your Akita. My name is Rebecca. I am a veterinarian and will do my best to help.
How is she acting? Is she anxious, pacing, straining at all? Is she taking care of the puppy?
It is possible that she is done, that there only was a singleton puppy. One way to know would be to palpate her uterus but that can be difficult in a large dog like an Akita. An Xray would be the best way to know if there are more puppies and how many more there are.
Sometimes a dog goes into labor and has a puppy, then a day later has the rest of them. It is not common, but I have seen this.
If she is still in labor (pushing like she is having contractions) and no puppy comes out, she may need help. Sometimes an injection of oxytocin will bring the next puppy (if there is another). Once in a while, even a large dog like an Akita needs to have a C section.
If you think she is pushing or in labor at all, and no puppies are coming, I would have her checked as soon as possible. If she seems calm, is eating, not in labor, and taking care of her puppy, then monitoring her might be fine. If she were mine I would definitely have an Xray taken today, so I would know for sure if there were more puppies.
Let me know how she is doing and what else I can help with or answer.