Hello again, and thank you for that additional information!
Vomiting and diarrhea in puppies can be due to several possible causes.
Some of the most common causes include:
1. Bacteria, virus, or parasite. This can range from a simple bacterial or viral infection that causes transitory symptoms that resolve in a day or 2, to more sever life-threatening infections that require medical intervention. Dogs can easily pick up any of the above just from being outdoors and eating grass/animal feces, drinking water from puddles, ponds, or streams, or just from licking their paws after being outside. The most severe intestinal viral infection in puppies are parvovirus and distemper, both of which are highly unlikely in adequately vaccinated individuals. In order to be fully protected, I do recommend at least 2 vaccines a month apart, with the last one falling no earlier than 16 weeks of age.
Another potential source of bacterial infection could be through the food itself. Unfortunately, the risk of this (particularly salmonellosis and e.coli) is much higher with raw meat diets. Although most raw food diet companies are stringent in their preparation protocols, the risk still exists.
2. Ingestion of a foreign object- this seems less likely since you have been keeping such a close eye on her, but not outside the realm of possibility. Sometimes they can be quite sneaky about it! I once had a dog who I found out was a sneaky sock eater and would steal them out of the laundry basket in my closet. Fortunately, she vomited them up on her own, and did not require surgical intervention...but they can get stuck and cause huge problems and I have had to remove socks and other objects surgically in more than a few dogs.
3. Ingestion of a plant or other substance that is irritating to the sensitive lining of the stomach.
There are several other less common causes, too many to list here. Since it has just been one episode of vomiting, and her appetite loss has been less than one day, my recommendations are the following:
1. Do not offer any more food tonight
2. Give her a Pepcid AC tablet (famotidine) 10 mg to soothe her stomach
3. In the morning, offer a meal of boiled white rice and fully cooked white chicken breast, about 1/2 of her normal serving size. If she eats it, you can offer another similar-sized meal 6-8 hours later. If she doesn't eat, or starts vomiting again, she will need to be seen by her veterinarian.
4. Either way, bring in a fresh stool sample to her veterinarian tomorrow, to be tested for parasites, so that they can be ruled out.