Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
It is hard to know what is causing this condition in poor little Bella. Hopefully, this is a mild digestive disturbance caused by something odd she may have ingested and in that case, the treatment is as follows:
Fast Bella for 12-24 hrs to allow the digestive tract to calm down and heal.
Give her Pepcid AC or Famotidine at 0.5 mg per pound every 8 hrs. That can be purchased over the counter at the pharmacy.
Give only small amounts of water during the fast or ice cubes
After the fast, feed rice and boiled chicken (2/1)
If the vomiting and Diarrhea have resolved, then wean her back onto regular food. If the vomiting persists especially during the fast, take Bella to your vet for an exam and lab work to determine the cause for this. This is extremely important since this can cause dehydration or other more serious concerns such as an infectious disease.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please REPLY so I can clarify for you.
Sincerely, ***** *****