Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
My first thought is that she may be suffering from an allergic reaction from either something she has ingested or something she has come into contact with. The treatment for this is Benadryl at 1 mg per pound every 12 hrs for 5-7 days. If the retching continues, this may also be due to a digestive disturbance and if this is the case, the treatment is as follows:
Fast your gal 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
If these are not helpful, then you will have to have your vet examine your gal to know for sure what is causing this distress for your gal.
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, ***** *****