Friend, when we see blood in the vomit it is safe to assume there could be something damaging the wall of either the esophagus (tube connecting stomach to mouth), stomach or first part of the small intestines. Less likely it can be caused by systemic diseases like liver disease, coagulation disorders, etc. to name a few causes.
In this case we are somewhat limited as to what you will be able to do at home. I would strongly recommend a hands on examination with a veterinarian, xrays and blood work as initial screening test to determine the exact underlying cause. Treatment will be based on exam and test results. In the meantime in any case of vomiting the first thing to do is give the stomach time to rest. 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 7-10 days. You can buy Pepcid AC over the counter in any pharmacy.
2- No food or water for 6-8 hours. Need to give her gastrointestinal tract time to rest.
3- After 6-8 hours offer a small amount of water. Wait half hour, if no vomiting, offer small amount of rice (50%) and boiled boneless chicken or ground beef (50%) 4-6 times a day. Keep on this diet for several days then wean into regular diet.
4- Follow up with your family veterinarian for a hands on examination. If cost is a concern look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost.
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