Friend, vomiting can be caused by many different conditions. It will be difficult for me to determine the exact underlying cause without a hands on examination and some testing as she is not showing any other symptoms. But, common causes are: A simple gastritis, dietary indiscretion, intestinal parasites, infections, etc. to name a few causes. The fact that sometimes she also has loose stool I would place intestinal parasites high on the list of possible causes. This is what you can try:
1- Do not give things like Pepto Bismol or imodium. Start her on Pepcid AC (famotidine) 10mg tablet every 12 hours for the next 7 days. You can buy Pepcid AC over the counter in any pharmacy.
2- I would get her dewormed. You can buy panacur (fenbendazole) online (amazon.com) or local pet store, give once a day at label dose for 3-5 days. Repeat after 3 weeks.
3- Supplement with a probiotic like Fortiflora. These are friendly bacteria that help with regularity and inflammation in the gastrointestinal tract.
4- Change her diet to a bland diet of rice (50%) and boiled boneless chicken or ground beef (50%). Divide her serving into 4-6 times a day. Keep on this diet until she is no longer vomiting and stool is normal. Then, wean her back into her regular diet over a period of 1 week.
5- If she continues to vomit after doing the above she will need to be seen by your family veterinarian for a hands on examination, xrays and blood work as initial screening test.
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