Friend, as you may already know vomiting can be caused by many different medical conditions. Could it be as a result of what she ate yesterday? Yes, but, there are many other possible causes like a simple gastritis, dietary indiscretion, pancreatitis, ingestion of a foreign body, infections, etc. to name a few causes. I am going to make some recommendations that you can try at home, if she continues to vomit then the next step would be a hands-on examination with a veterinarian. 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 2-3 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 a 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- If she continues to vomit after doing the above or develops other symptoms like diarrhea, abdominal swelling, profound lethargy, pale gums, etc. she will need to be seen by a veterinarian for a hands on examination.
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