Good Morning and welcome to Just answer. I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
The pregnancy process as well as feeding the puppies will take a lot out of your girl. It is good to give her puppy food but also give her the canned puppy food and add 2 tablespoons of vegetable oil to her food. This will add pure calories and help her regain her weight. Increase her food consumption by adding more canned food.