It's important that you understand the symptoms of hypoglycemia. One of the symptoms is lack of appetite, it's like they get too hungry and they lose their appetite, that's why it's important to keep food out all the time. Their little tummies can't hold much so they have to eat frequently. You can rub a little white Karo syrup on her gums, or buy some Nutri-cal, which is essentially the same thing, corn syrup which is fast acting sugar that goes into the blood stream immediately. It’s important that they are given protein within 20 minutes of the corn syrup or they will have another episode of hypoglycemia. Also, is this puppy food? I always tell people not to switch foods from what the breeder was feeding for at least a month, it might cause intestinal problems.
Toy Breed Hypoglycemia