Amoxi drops are an antibiotic so there are no over the counter remedies that you can use. They only come by prescription.
I would suggest that you change her diet for the rest of the weekend to a diet of ONLY boiled chicken ( no bones, no skin ) and white rice. Don't give treats, table scraps or other food. Only feed her the chicken mixture. Baby food in jars works well, too. Just be sure to choose a food with no garlic and no onions.
Your vet might recommend using some tagamet to fight any acid reflux that is causing a problem. I can't tell you the dosage for a dogs so small but your vet can tell you what to use over the phone.
I hope that this helps. If you have more specific questions, feel free to ask!
