Friend, we need to remember that vomiting is not a disease but a symptom of problems in the gastrointestinal tract or secondary to a systemic disease. It is a bit of a concerned that she has been vomiting for 3 days; I am concerned about her hydration. In this case, I would strongly recommend having her checked in the morning by your vet for a hands-on examination and to start her on IV fluids. In addition, run some testing to determine the cause of the vomiting. In the meantime, this is what you can do:
1- Do not give things like Pepto Bismol or Imodium. Start her on Pepcid AC (famotidine) 10mg 1/4 tablet every 12 hours for the next 2-3 days. You can buy Pepcid AC over the counter in any pharmacy.
2- No food or water for 3-4 hours. Need to give her gastrointestinal tract time to rest.
3- After 3-4 hours offer a small amount of water. Wait half hour, if no vomiting, continue to give her water. Leave her without food for 8-12 hours then offer a small amount of rice (50%) and boiled boneless chicken or ground beef (50%) 4-6 times a day. Keep her on this diet for several days then wean her into her regular diet.
4- Follow up with your family veterinarian for a hands on examination. If cost is a concerned I would look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost.
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